Support callback URIs in application updates

[AaronDDM]

Context

Follow-up to the review feedback on nylas-java#327. PATCH /v3/applications accepts callback_uris, and callers need to include an existing callback URI id when preserving or updating entries. The Python SDK typed request model did not expose that shape.

Summary

• Add UpdateApplicationRedirectUriRequest with optional id, platform, and settings.
• Add callback_uris to UpdateApplicationRequest and remove stale docs saying callback URIs are ignored.
• Cover forwarding a callback_uris entry with an existing id in the application update test.
• Update the Unreleased changelog for application callback URI preservation and invalid_also workspace auto-group support.

Testing

• .venv/bin/black --check nylas/models/application_details.py nylas/resources/applications.py tests/resources/test_applications.py
• .venv/bin/python -m pytest tests/resources/test_applications.py -q
• GitHub Actions: passing

[qasim-nylas]

LGTM 👍