added a lightweight GC profiling option (dotnet/coreclr#22866)

added a lightweight GC profiling option (dotnet/coreclr#22866)

added a profiling event mask in the high 32-bit, COR_PRF_HIGH_BASIC_GC, for basic GC monitoring. it can be set via `ICorProfilerInfo5::SetEventMask2`. all this gives you is

    * GC start callback

    * GC end callback

    * update generational bounds

note that one different behavior between this and the existing COR_PRF_MONITOR_GC is, aside from the obvious that it doesn't give you any info beyond the above, is that the GC end callback + update generational bounds are enabled for _all_ GCs, not just non concurrent GCs. I kept the behavior the same for COR_PRF_MONITOR_GC because I don't want to risk breaking existing profiling tools that do not anticipate these for concurrent GCs.

Commit migrated from https://github.com/dotnet/coreclr/commit/ea099fba14da84c3e81eb8d5ad93ecae7c659489