feat: Add support for Table resource tags

[PhongChuong]

This adds Table resource tags. This is accomplished by refactoring Labels to Annotation and using Annotation for resource tags.

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Fixes #3045 ☕️

This PR does not include integration tests for table resource tags due to the complexity of the setup outside. See BigQuery Go implementation for more details

[shollyman]

Would be great to update this PR's description with the Labels->Annotations refactor. I was initially confused by this PR until a I realized that Labels was a private class and not a type exposed to the user.

Also, it may be worth wiring in resource tags testing into the unit tests within TableInfoTest.java. It already appears to include labels testing.

[PhongChuong]

Thanks for the review.

Updated:

• the description to include note on Label->Annotation refactoring
• TableInfoTest.java to include resource tags in the test

[shollyman]

Thanks!