Update OTIO to use new TraitsData API

[foundrytom]

What

Update to use the new API as per OpenAssetIO/OpenAssetIO#348.

Why

The current code is incompatible with releases later than v1.0.0-alpha.1.

Note

See https://github.com/OpenAssetIO/OpenAssetIO/blob/75b61fdbe6565f0dfac3a9bd6d618b38dfcfcfcb/resources/examples/host/simpleResolver/simpleResolver.py#L160 (and other uses within that host) as an example.

This will also require OpenAssetIO/OpenAssetIO-MediaCreation#10 to be done, which might mean it's just worth waiting for OpenAssetIO/OpenAssetIO-MediaCreation#11.

• Includes Use PyPI openassetio in otio-openassetio #13

ACs

• Code outwardly works as per the existing version consuming openassetio v1.0.0a6 or later