### Apache Airflow Provider(s)

sendgrid

### Versions of Apache Airflow Providers

I'm running this version of airflow locally to test the providers modules. I'm interested in sendgrid, however it doesn't show up as a conn type in the UI making it unusable.  

The other packages I've installed do show up.

```
@linux-2:~$ airflow info

Apache Airflow
version                | 2.1.2                                              
executor               | SequentialExecutor                                 
task_logging_handler   | airflow.utils.log.file_task_handler.FileTaskHandler
sql_alchemy_conn       | sqlite:////home/airflow/airflow.db        
dags_folder            | /home/airflow/dags                        
plugins_folder         | /home/airflow/plugins                     
base_log_folder        | /home/airflow/logs                        
remote_base_log_folder |                                                    
                                                                            

System info
OS              | Linux                                                                                                                                                                                   
architecture    | x86_64                                                                                                                                                                                  
uname           | uname_result(system='Linux', node='linux-2.fritz.box', release='5.11.0-34-generic', version='#36~20.04.1-Ubuntu SMP Fri Aug 27 08:06:32 UTC 2021', machine='x86_64', processor='x86_64')
locale          | ('en_US', 'UTF-8')                                                                                                                                                                      
python_version  | 3.6.4 (default, Aug 12 2021, 10:51:13)  [GCC 9.3.0]                                                                                                                                     
python_location |.pyenv/versions/3.6.4/bin/python3.6                                                                                                                                      
                                                                                                                                                                                                          

Tools info
git             | git version 2.25.1                                               
ssh             | OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f  31 Mar 2020     
kubectl         | Client Version: v1.20.4                                          
gcloud          | Google Cloud SDK 357.0.0                                         
cloud_sql_proxy | NOT AVAILABLE                                                    
mysql           | mysql  Ver 8.0.26-0ubuntu0.20.04.2 for Linux on x86_64 ((Ubuntu))
sqlite3         | NOT AVAILABLE                                                    
psql            | psql (PostgreSQL) 12.8 (Ubuntu 12.8-0ubuntu0.20.04.1)            
                                                                                   
                                                                                                                                                                                                                        

Providers info
apache-airflow-providers-amazon   | 2.0.0
apache-airflow-providers-ftp      | 2.0.1
apache-airflow-providers-google   | 3.0.0
apache-airflow-providers-http     | 2.0.1
apache-airflow-providers-imap     | 2.0.1
apache-airflow-providers-sendgrid | 2.0.1
apache-airflow-providers-sqlite   | 2.0.1

```

### Apache Airflow version

2.1.2

### Operating System

NAME="Ubuntu" VERSION="20.04.2 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.2 LTS" VERSION_ID="20.04" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" VERSION_CODENAME=focal UBUNTU_CODENAME=focal

### Deployment

Other

### Deployment details

I simply run `airflow webserver --port 8080` to test this on my local machine. 

In production we're using a helm chart, but the package also doesn't show up there prompting me to test it out locally with no luck. 

### What happened

Nothing

### What you expected to happen

sendgrid provider being available as conn_type

### How to reproduce

run it locally using localhost

### Anything else

nop

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/www/views.py
dag = dag.partial_subset(task_ids_or_regex=root, include_downstream=False, include_upstream=True)
        num_runs = request.args.get('num_runs', type=int)
        if num_runs is None:
            num_runs = conf.getint('webserver', 'default_dag_run_display_number')
        try:
            base_date = timezone.parse(request.args["base_date"])
        except (KeyError, ValueError):
            base_date = dag.get_latest_execution_date() or timezone.utcnow()
        with create_session() as session:
            dag_runs = (
                session.query(DagRun)
                .filter(DagRun.dag_id == dag.dag_id, DagRun.execution_date <= base_date)
                .order_by(DagRun.execution_date.desc())
                .limit(num_runs)
                .all()
            )
            dag_runs = {dr.execution_date: alchemy_to_dict(dr) for dr in dag_runs}
            tree_data = self._get_tree_data(dag_runs, dag, base_date, session=session)
        
        return htmlsafe_json_dumps(tree_data, separators=(',', ':'))
    @expose('/robots.txt')
    @action_logging
    def robots(self):
        """
        Returns a robots.txt file for blocking certain search engine crawlers. This mitigates some
        of the risk associated with exposing Airflow to the public internet, however it does not
        address the real security risks associated with such a deployment.
        """
        return send_from_directory(current_app.static_folder, 'robots.txt')
class ConfigurationView(AirflowBaseView):