Consider SARIF support for tool output -> MSBuild logs

The Microsoft C++ team is [considering](https://devblogs.microsoft.com/cppblog/the-future-of-c-compiler-diagnostics-in-msvc-and-visual-studio/) adding [SARIF](https://github.com/microsoft/sarif-tutorials/blob/main/docs/1-Introduction.md) support to the MSVC toolchain. That allows capturing much more information about errors/warnings than we currently support, through the [canonical error format](https://learn.microsoft.com/visualstudio/msbuild/msbuild-diagnostic-format-for-tasks).

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.