feat: add RFCs for unique store and model names

[aaguiarz]

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

If you haven't done so yet, we would appreciate it if you could star the OpenFGA repository. :)

[kalleep]

Having the option to run openFGA with unique store names would be great.

For us the first motivation would apply and without it we would need to implement mapping from our internal tenant id to store id. We never want to get to a scenario where multiple stores shares the same name

[kalleep]

Suggested change

	- OpenFGA [GetStores endpoint](https://openfga.dev/api/service#/Stores/GetStore) endpoint should support filtering by name. Given it's possible that there could be more than one store with the same name, it needs to return an array. If the store name is unique, it will return an array with a single element.
	- OpenFGA [ListStores endpoint](https://openfga.dev/api/service#/Stores/ListStores) endpoint should support filtering by name. Given it's possible that there could be more than one store with the same name, it needs to return an array. If the store name is unique, it will return an array with a single element.

[3schwartz]

Suggested change

	- Add a `name` parameter to the (https://openfga.dev/api/service#/Authorization%20Models/WriteAuthorizationModel).
	- Add a `version` parameter to the (https://openfga.dev/api/service#/Authorization%20Models/WriteAuthorizationModel).

A suggestion for improvement: consider using “version” instead of “name” for identifying authorization models. While stores benefit from having unique names tied to their domain, authorization models are better suited to identification through meaningful versions, such as 1.0.1 → 1.0.2 or Git commit hashes. The store already provides the domain context.