feat(grouping): Tally frame types while building exception grouping components

[lobsterkatie]

This adds a tally of the four possible types of frames (in-app vs system, each of which can be contributing or not) to exception and chained exception grouping components created by the newstyle config. To make this work:

• First, each FrameGroupingComponent stores on itself whether it's in-app or not.*
• Then, as we're walking through the frames when building the StacktraceGroupingComponent, we note each frame component's in_app and contributing values, and keep a running tally of the different frame types, which we then store on the stacktrace component.
• Next, when creating an ExceptionGroupingComponent, we read the frame tally from the stacktrace component and store it on the exception component.
• Finally, if we have a chained exception, we add up the tallies from the individual exception components and store a combined tally on the ChainedExceptionGroupingComponent.

Having this data will enable us to do a few different things (in follow-up PRs, if and when we choose to):

• Gather metrics on the precise mix of frames. Right now we have a separately-calculated in_app_frame_mix metric, which just records the presence, or lack thereof, of in-app and system frames in the initial event in a group; should we choose, this will allow us to gather more detailed metrics. (One place this might be useful is as we start automatically adding code-mappings-based stacktrace rules to projects, to see the change in percentage of in-app vs system frame.) We also could consider switching the frame mix metric to rely on these counts, as it would make the code quite a bit simpler.
• Store this information in grouphash metadata.
• Use the information when deciding whether to send events to Seer.

*Note: Though in general this PR only applies to newstyle grouping, I did add in-app tracking to legacy frame components, too, to make them compatible with the newly-modified assemble_stacktrace_component helper both configs use.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

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