feat: add content tag serialization/deserialization [FC-0049]

[rpenido]

Description

This PR adds support to serialize/deserialize tag info from the block XML, adding it to the new xml_attributes property. This is used to allow pasting DragAndDrop components with their applied tags.

More Information

• Part of: [Tagging] Pasting XBlocks containing Tag data in clipboard modular-learning#180

Testing instructions

• Please ensure that the tests cover the expected behavior
• Follow the instructions at feat: paste tags when pasting xblocks with tag data [FC-0049] openedx-platform#34270 and check if you can copy/paste a DragAndDrop with tags and ensure that the tags are copied correctly

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[openedx-webhooks]

Thanks for the pull request, @rpenido! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
• any other information that can help Product understand the context for the PR

All technical communication about the code itself will be done via the GitHub pull request interface. As a reminder, our process documentation is here.

This is currently a draft pull request. When it is ready for our review and all tests are green, click "Ready for Review", or remove "WIP" from the title, as appropriate.

[rpenido]

Updating edx-platform with this version caused an error in a test. I will check it tomorrow.

[pomegranited]

Shouldn't have to do this.. cf openedx/openedx-platform#34270 (comment)

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