Add AnyDictionary and AnyVector support for V2d and Box2d

[peter-targett]

Fixes #1714

Summarize your change.

Add Imath V2d and Box2d types so they can be added as metadata in AnyDictionary and AnyVector containers.

Reference associated tests.

Add basic tests for V2d and Box2d to serializable object tests. Also, adapt the composable object test, to test metadata serialization.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.66%. Comparing base (c0e97b0) to head (4ae2fec). Report is 29 commits behind head on main.

Additional details and impacted files

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