**Description**

Replace the Configuration JSON text-area with a form that has individual input fields for each key & value. This will remove the need for the user to provide a json object. See hashicorp vault's key-value secrets UI for an example of what this might look like:

![Screenshot 2020-09-21 at 12 06 03](https://user-images.githubusercontent.com/17148324/93759844-df04f680-fc02-11ea-8613-f3bcc0b22d09.png)
 
- If present these keys and values should be serialised as json client-side and posted to the trigger-dag API endpoint as the `conf` request-parameter.
- By default no conf request-parameter is sent. Perhaps a checkbox should be used to determine whether conf is sent at all?
- The user may want to add new keys, or remove keys & values that they have previously added.
- [PR-10839](https://github.com/apache/airflow/pull/10839) is pre-populating the form with the DAG's default params. The new form should be pre-populated with the keys & values from `DAG.params`


**Use case / motivation**

Currently when triggering a manual DAG run with user-provided runtime parameters, the user has to provide a correctly formatted JSON object. Filling in a form with keys & values will be a significantly better user experience, and will be less error prone & laborious than handling json in a free-text field.

This builds on the great work already done on enhancing the Trigger-DAG functionality

**Related Issues**

Originating PR: https://github.com/apache/airflow/pull/10839
"""Home view."""
        from airflow.models.dag import DagOwnerAttributes
        hide_paused_dags_by_default = conf.getboolean("webserver", "hide_paused_dags_by_default")
        default_dag_run = conf.getint("webserver", "default_dag_run_display_number")
        num_runs = request.args.get("num_runs", default=default_dag_run, type=int)
        current_page = request.args.get("page", default=0, type=int)
        arg_search_query = request.args.get("search")
        arg_tags_filter = request.args.getlist("tags")
        arg_status_filter = request.args.get("status")
        arg_sorting_key = request.args.get("sorting_key", "dag_id")
        arg_sorting_direction = request.args.get("sorting_direction", default="asc")
        if request.args.get("reset_tags") is not None:
            flask_session[FILTER_TAGS_COOKIE] = None