v2 beta - improve usability

[SVappsLAB]

Improve SDK usability and ease of use

Improve the most common use case (subscribe to a few streams and react), without forcing consumers to wire up await foreach loops or stream-subscription extensions.

• Add new TelemetryHandlers type - a bag of optional async callbacks: OnTelemetryUpdate, OnSessionInfoUpdate, OnRawSessionInfoUpdate, OnConnectStateChanged, OnError
• Add new Monitor(TelemetryHandlers handlers, CancellationToken ct) overload - the simplest way to consume telemetry. It starts stream consumption, runs monitoring, and returns when monitoring ends. SDK processing errors are output to the OnError stream. Errors in the users 'handler' are thrown back to the application.

See README.md and Sample projects for examples and details