**Description**

Add the missing AWS Operators for the three (get/put/delete) AWS S3 bucket tagging APIs, including testing.

**Use case / motivation**

I am looking to add an Operator that will implement the existing API functionality to manage the tags on an AWS S3 bucket.

**Are you willing to submit a PR?**

Yes

**Related Issues**

None that I saw

airflow/providers/amazon/aws/hooks/s3.py
"""
        Returns a boto3.s3.Object
        :param key: the path to the key
        :type key: str
        :param bucket_name: the name of the bucket
        :type bucket_name: str
        :return: the key object from the bucket
        :rtype: boto3.s3.Object
        """
        obj = self.get_resource_type('s3').Object(bucket_name, key)
        obj.load()
        return obj
    @provide_bucket_name
    @unify_bucket_name_and_key
    def read_key(self, key: str, bucket_name: Optional[str] = None) -> str:
        """
        Reads a key from S3
        :param key: S3 key that will point to the file
        :type key: str
        :param bucket_name: Name of the bucket in which the file is stored
        :type bucket_name: str
        :return: the content of the key
        :rtype: str
        """
        obj = self.get_key(key, bucket_name)
        return obj.get()['Body'].read().decode('utf-8')
    @provide_bucket_name
    @unify_bucket_name_and_key
    def select_key(