For each SDK, add a minimal example application

[rhamzeh]

The example application would be minimal, just enough to show how one might use the SDK.

It would be sort of a cross between the README and the tests.

It would:

1. Create a store
2. Create another store
3. List Stores (page size 1, paginating)
4. Delete one of the stores
5. Write two example authorization models
6. Read the models, with page size 1, and paginating between them
7. Read the latest model
8. Write some tuples
9. Run some checks
10. Run ListObjects and ListRelations
11. Delete some tuples
12. Run ReadChanges

An added benefit is that it can act as a sort of manual integration test that we can run before releasing the SDK to ensure that nothing broke.

• JS SDK (feat(js-sdk): add example js project #305)
• Go SDK (release(v0.3.3): with WriteAuthorizationModel fix go-sdk#69)
• .NET SDK (release(v0.3.0)!: support for conditions and some breaking changes dotnet-sdk#36)
• Python SDK (release(v0.3.3): misc fixes python-sdk#55)
• Java SDK (chore: add example java/kotlin projects java-sdk#40)