**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
"""
        Checks if a key exists in a bucket
        :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: True if the key exists and False if not.
        :rtype: bool
        """
        try:
            self.get_conn().head_object(Bucket=bucket_name, Key=key)
            return True
        except ClientError as e:
            if e.response["ResponseMetadata"]["HTTPStatusCode"] == 404:
                return False
            else:
                raise e
    @provide_bucket_name
    @unify_bucket_name_and_key
    def get_key(self, key: str, bucket_name: Optional[str] = None) -> S3Transfer: