Dev-server sub processes

[dr1rrb]

What would you like to be added

We should extract app's processing (i.e. server processors) into a dedicated process.

Why is this needed

Currently we try to determine the right version of the dev-server to start depending of the version of .net configured in the solution. This cause some trouble when the version configured does not match a valid version of the dev-server (e.g. solution is fine using .net9.0-preview while the dev-server requires .net9.0-rc).

For which platform

No response

Anything else we need to know?

We are matching a specific of version of .net for the dev-server for the HRserverProcessor. If it's being pushed into another process that is started when the app connects back to the dev-server (providing the right version of .net SDK to use -removing the need to determine it by our own-), we no longer have to start tight the version of the dev-server to use with the version used by the project.

We have 2 possible options:

1. Extract all server processors into the dedicated process
2. Extract only the HR processor

In both cases we will need to provide a communication mechanism between the sub-process and the dev-server.