chore: sync back sdk generator changes

[rhamzeh]

Description

This brings in several changes (and should not be squashed).

It will:

• Bring in generator changes Generator PR: openfga/sdk-generator#420
• Limit default retries to 3
• Update Docs
• Update API definitions to support assertions context and contextual tuples
• Support contextual tuples in Expand
• Support for start time in read changes request
• Fix ListRelations swallowing errors

Note: This brings in all the API changes up to the most recent, however the wrapper OpenFgaClient does not yet support server-side BatchCheck. That will be in a followup PR

References

Includes and replaces #92, Closes #92 Closes #101 Closes #95

Review Checklist

• [x] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [x] The correct base branch is being used, if not main
• [ ] I have added tests to validate that the change in functionality is working as expected

Generator PR: openfga/sdk-generator#420