Add process launchers

[rohitgr7]

What does this PR do?

Fixes #10985

Does your PR introduce any breaking changes? If yes, please list them.

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cc @Borda @kaushikb11 @rohitgr7 @justusschock @awaelchli @akihironitta

[awaelchli]

partial review, great work so far

[carmocca]

Awesome job! @rohitgr7 @awaelchli

Looking forward to those follow-ups

[awaelchli]

I will follow up with clean up for #10895

[rohitgr7]

thanks, @awaelchli for the discussions for this PR :)