Add FrontControllerLaunchOptions.ForceInProcess to support NCrunch

[bradwilson]

NCrunch wants to be able to load the test assembly in-process, even for v3 test projects (which are typically out of process). This flag would allow us to load the test assembly in-process, on the assumption that NCrunch is already setting up to do all the necessary dependency resolution.

I think I'm going to end up with a flag you can pass for launch options, per our previous discussion. Nothing's wired up yet, but this would be a base set of options that are available to all the front controller methods in v3 runner utility (Find, FindAndRun, and Run):

What it would do for v3 projects would be to load the .exe in-process and find the entry point, and then call it with all the correct arguments. I'm already constructing the argument list on behalf of the out-of-process invocation anyway. If user's customize the entry point, it'll end up calling them just like launching the executable would.

That's the theory, anyways. 🤞🏼

Discussion: #2337 (comment)

Edit: This issue has a dependency on #2951 being finished first.

[bradwilson]

Verified that we have provided NCrunch with everything they need for integration at this point. They can open new issues if they uncover specific problems.