maya directional light and usd distant light translator - second try

[wengn]

Description (this won't be part of the changelog)

This schema translator demonstrates how a maya directional light convert to a usd distant light and vice versa

Changelog

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Added

maya directional light import/export

Changed

Deprecated

Removed

Fixed

Checklist (Please do not remove this line)

• [ ] Make sure the Title and Description of the PR make sense and provide sufficient context for your work
• [ ] Do any added files have the correct AL Apache Licence Header?
• [ ] Are there Doxygen comments in the headers?
• [ ] Are any new features, behaviour changes documented in the .md format documentation?
• [ ] Have you added, updated tests to cover new features and behaviour changes?
• [ ] Have you filled out at least one changelog entry?

[wengn]

Closing this one, as I will submit a new pull request to finish this task.