feat: add tag and taxonomy sink

[Ian2012]

Description

This PR adds two new sinks for the Tag and Taxonomy models in openedx-learning.

Closes: openedx/tutor-contrib-aspects#926
Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
__init__.py
signals.py
tasks.py
utils.py
platform_plugin_aspects/sinks
__init__.py
serializers.py					232, 257
tag_sink.py
Project Total

This report was generated by python-coverage-comment-action

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