Parsing of new GC events

[cshung]

This change performs the parsing of the new events introduced in dotnet/runtime#55888.

At a high level, here are the code changes:

• Make the GenAware trace parsing more consistent with the manifest, in particular, I collapsed the GenAwareBeginTraceData and GenAwareEndTraceData into a single class GenAwareTemplateTraceData. These two classes are identical anyway. I also renamed the event GCGenAwareStart to GCGenAwareBegin to be consistent with the manifest as well.

My motivation for doing this change is to experiment with my idea at https://github.com/cshung/perfview/tree/private/trace-event-matcher. It is a prototype that I built to compare ClrTraceEventParser.cs with ClrEtwAll.man so that we can find holes in our event parsing logic. I have no plans to productize yet.

• Introduce the new GCLOHCompact, GCFitBucketInfo, and GCSettingsRundown events. These events are newly introduced in .NET 6.

• Parse the new V4 GCAllocationTick event that includes a new field named ObjectSize

• Parse the new V4 GCGlobalHeapHistory event that includes an array of timestamps.

• Add the missed PinnedObjectHeap enum value for the CreateSegment event.

• Add the GC keyword to the default rundown keywords.

In addition to the events exposed on ClrTraceEventParser, we also expose the data through TraceGarbageCollector as public property and TraceGC as public fields (to be consistent with other fields).

This info is also reflected in the raw XML for the GCStat page.

[brianrob]

        sb.Append("/>");

I would expect the Count and Times to be written out here.

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Refers to: src/TraceEvent/Parsers/ClrTraceEventParser.cs:6977 in 6c0019c. [](commit_id = 6c0019c, deletion_comment = False)

[brianrob]

@cshung, a few comments, but overall, looks good.

[cshung]

        sb.Append("/>");

Similarly, Times is an array, how exactly do we do that?

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In reply to: 1370367894

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Refers to: src/TraceEvent/Parsers/ClrTraceEventParser.cs:6977 in 6c0019c. [](commit_id = 6c0019c, deletion_comment = False)

[Maoni0]

LGTM!