refactor: remove read-tuples and add this functionality to read

[craigpastro]

Changes for read all tuples:

• If the tuple is empty in the read request then return all the tuples.
• Remove authorization model id from Read request

Description

References

Review Checklist

• [ ] 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]
• [ ] 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