feat: support usage of the consistency option

Description

This is an initial attempt at introducing support for the experimental consistency option in the relevant APIs, this is supported on the following APIs:

Check
List Users
List Objects + Streamed List Objects
Expand
Read

And the following SDK methods

listRelations
batchCheck

When introducing this option to the OpenFGAClient class, we decided that this option fits better in the options object as opposed to the request object as it's more of an "override" choice akin to the existing model ID and store ID.

So the usage looks like so

const { allowed } = await fgaClient.check({
  user: "user:anne",
  relation: "viewer",
  object: "document:roadmap",
}, { consistency: ConsistencyPreference.HigherConsistency });

I think there is a question around the correct usage for batchCheck, in that instance should the consistency choice be per check or for the entire batchCheck, currently we have it for the entire batchCheck but personally I don't think this is ideal.

await fgaClient.batchCheck([{
  user: "user:anne",
  relation: "viewer",
  object: "document:roadmap",
}], { consistency: ConsistencyPreference.HigherConsistency });

References

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

openfga / js-sdk