feat: Cedar SDK 4.3.2 support

[hakanson]

Description of changes

• update to Cedar CDK 4.3.2 and Cedar language 4.2 including experimental datetime extension
• Rust code updates against SDK and various cleanup / refactor tasks
• add tests, test data, and increase test coverage
• update "human-readable schema" usage to "Cedar schema"

Issue #, if available

#32

Checklist for requesting a review

The change in this PR is (choose one, and delete the other options):

• A backwards-compatible change requiring a minor version bump to vscode-cedar.

I confirm that this PR (choose one, and delete the other options):

• Updates the CHANGELOG with a description of my change (required for version bumps).

Disclaimer

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[hakanson]

draft PR to build the .vsix file for additional testing

note: treat individual commit as work-in-progress - they were grouped for easier code review, the project may not build correctly if individually applied