Add command-line-api repo reference

[AntonLapounov]

Fixes #42637.

[jkotas]

System.CommandLine package has poor performance that we need to do something about. Also, I suspect that System.CommandLine will require more work in https://github.com/dotnet/source-build .

Should we rather switch back to the light-weight command line parser we used to have? (You can take it from https://github.com/dotnet/runtimelab/tree/feature/NativeAOT/src/coreclr/src/tools/System.CommandLine/System/CommandLine).

[ViktorHofer]

cc @trylek who I believe switched to it (50c3665).

[crummel]

@jkotas We actually already added this as part of our prebuilt removal - I logged this issue because System.CommandLine was not actually included in the tree anywhere and we had to add it to our Version.Details.xml. That being said, source-build will never be upset about removing a repo dependency if that works better for you.

[davidwrighton]

@AntonLapounov do you intend to merge this PR, or are we just going to remove all use of this command line parser?

[AntonLapounov]

While I have removed its usage from Crossgen2, it is still used in 4 projects: https://github.com/dotnet/runtime/search?q=SystemCommandLineVersion. Do we have to remove it from everywhere in order to not merge this PR, or just from the components that we ship?

[AntonLapounov]

According to @crummel, we only need to remove this dependency from shipping components and anything that is required to build those shipping components. I am abandoning this PR.