Terminal Logger: Rewritable Logger API spec

[JanKrivanek]

Context

In case a build plugins are combining usage of Logger API and direct console writes - the output will get undesirably mangled. Sample issue manifestations:

• https://github.com/dotnet/msbuild/issues/9061 (caused by https://github.com/microsoft/vstest/issues/1503)
• https://github.com/dotnet/msbuild/issues/9068
• https://github.com/dotnet/msbuild/issues/9291
• https://github.com/dotnet/msbuild/issues/6944

Goal

• Design spec
• Detailed API proposal
• [optional] prototype/spike of the API implementation (to verify feasibility)
• Comunicate plan to partners (Test team, Nuget Client team)

[JanKrivanek]

Related: #6944