Initial work to enable native events in EventPipe

[LakshanF]

Initial support for native event support to EventPipe, with GC events seen with the RuntimeProvider, that matches the existing EtwProvider support in NativeAOT.

Similar to the existing EtwProvider work in NativeAOT, the EventPipeProvider code is checked in, as opposed to using the python generated code. Unlike the EtwProvider, the code is in the opt-in EventPipe library (eventpipe-enabled.lib). There is corresponding minimal implementation in the disabled default EventPipe (eventpipe-disabled.lib).

Both managed and native events can be seen with tools like PerfView or dotnet-trace (collect option) by enabling the providers (in the native case, with Microsoft-Windows-DotNETRuntime for dotnet-trace and by selecting GC options in PerfView).

There will be a future effort to enhance the existing GC events with the right set of native events for NativeAOT.

[LakshanF]

/azp run runtime-extra-platforms

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Azure Pipelines successfully started running 1 pipeline(s).

[LakshanF]

/azp run runtime-extra-platforms

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Azure Pipelines successfully started running 1 pipeline(s).

[davidwrighton]

Looks ok, but I'd like to see a signoff from someone actively working on NativeAOT as well.

[VSadov]

LGTM Thanks!!