Rework the SDK Testing Framework

[rhamzeh]

Checklist

• [X] I agree to the terms within the OpenFGA Code of Conduct.

Describe the problem you'd like to have solved

Currently tests are inconsistent between the SDKs and writing tests for each SDK is time consuming

Describe the ideal solution

We want to have a way to express tests in a standard format (yaml, cucumber, etc..) and then implement a test runner per SDK. That would allow us to have consistency between the SDKs as we fix bugs in one SDK we'll have to fix it in all the others.

Additionally we would like to investigate better cross-SDK mocking frameworks such as wiremock and better integration tests

We would also need to improve the code coverage to over 80%

Alternatives and current workarounds

No response

References

No response

Additional context

No response