Consider SARIF support for tool output -> MSBuild logs

[rainersigwald]

The Microsoft C++ team is considering adding SARIF support to the MSVC toolchain. That allows capturing much more information about errors/warnings than we currently support, through the canonical error format.

MSBuild should consider extending the tool-output-scraping support to include SARIF output, and map the SARIF format to our error/warning structured events.

This might also help with issues like #8019 that primarily arise because an error cannot today have supplemental information.

[rainersigwald]

One thing that might be important: today's output scanners are line-at-a-time, so this might require tool output SARIF to be in JSON lines.

[rainersigwald]

@yuehuang010 is working on this.