[darwin/tv-casting-app] Change Discover Commissioners API from polling based to callback based

[sharadb-amazon]

Reproduction steps / Feature

In the darwin tv-casting-app, the discoverCommissioners API call must be followed by a getDiscoveredCommissioners call after a certain period of time. This is not ideal because the wait time is non-deterministic and leads to the implementation of polling behaviour on the client side. Change the API to be callback based so that the client is called whenever a new commissioner is discovered.

Platform

darwin

Platform Version(s)

No response

Type

Manually tested with SDK

(Optional) If manually tested please explain why this is only manually tested

No response

Anything else?

No response

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