Add aws ses email backend for use with EmailOperator.

[jmcarp]

Add aws ses email backend for use with EmailOperator. Replaces #13463.

[potiuk]

Nice!

[github-actions]

The Workflow run is cancelling this PR. It has some failed jobs matching ^Pylint$,^Static checks,^Build docs$,^Spell check docs$,^Backport packages$,^Provider packages,^Checks: Helm tests$,^Test OpenAPI*.

[github-actions]

The PR is likely OK to be merged with just subset of tests for default Python and Database versions without running the full matrix of tests, because it does not modify the core of Airflow. If the committers decide that the full tests matrix is needed, they will add the label 'full tests needed'. Then you should rebase to the latest master or amend the last commit of the PR, and push it with --force-with-lease.

[potiuk]

Some static check failures @jmcarp though :)

[github-actions]

The Workflow run is cancelling this PR. Building image for the PR has been cancelled

[potiuk]

Pylint errors :(. @jmcarp -> pre-commits are helpful :). I save a lot of time thanks to them :)

tests/providers/amazon/aws/utils/test_emailer.py:20:0: W0611: Unused import copy (unused-import)
tests/providers/amazon/aws/utils/test_emailer.py:21:0: W0611: Unused import os (unused-import)
tests/providers/amazon/aws/utils/test_emailer.py:22:0: W0611: Unused import tempfile (unused-import)
tests/providers/amazon/aws/utils/test_emailer.py:23:0: W0611: Unused import unittest (unused-import)