Implement AuthenticationMethod support in `IInstanceClient`

[danielskovli]

Description

IDataClient recently implemented a new optional authentication override.

This same methodology should be implemented in IInstanceClient.

Tasks

• Add optional StorageAuthenticationMethod and CancellationToken parameters to all applicable methods on IInstanceClient
• Default/undefined usage should resolve to StorageAuthenticationMethod.CurrentUser
• Inject IAuthenticationTokenResolver and use this for JwtToken resolution (example)
• Update unit tests to observe that correct tokens are used in the various scenarios. This can be a bit tedious, and borrowin inspiration from the DataClientTests may be helpful

[danielskovli]

@tina-ahm any updates on this?

Edit: Seems like perhaps this is in @martinothamar's hands now 🙂