Tooling for individual repo synchronization

[premun]

Context

Based on the investigations done in #10257 we should productionalize tooling that would be able to synchronize the individual repos inside of the VMR.

PoC tooling to synchronize the VMR can be found in dotnet-vmr-tools.

Goals

Have a tool ready that would synchronize commits from individual repos into the VMR based on the source-mappings.json file.

Non-functional goals

• Figure out the best spot for the tooling
• Separate CLI from the logic to allow usage in Maestro, MSBuild...

[premun]

I think this is finished as we can now flow the tooling and use it in installer