Core Profiler - Extensions Fetching Async Task

[rjchow]

The new core profiler's development has begun and the basic framework for it has been merged in #37628

One of the supplementary tasks to proceed with further development is to create the ability for the state machine to trigger asynchronous data fetching operations, one of which is fetching the extensions to be installed.

This is suggested to be implemented using either a parallel state machine or a service invocation, which should then store the request status and extensions data back in the machine context.