Add GC.GetConfigVariable API, and support more GC settings in runtimeconfig #162
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Currently, a few GC settings are only available as environment variables.
This adds support for a few more as runtimeconfig settings.
They are:
COMPlus_GCCpuGroup
COMPlus_GCHighMemPercent
COMPlus_GCLargePages
COMPlus_GCHeapAffinitizeRanges
This is similar to dotnet/coreclr#25574,
which did this for "System.GC.HeapHardLimit" and "System.GC.HeapHardLimitPercent".
This PR also adds a new API described in dotnet/corefx#42499 .