ref: Move ThreadInspector initialization to Swift

[noahsmartin]

This moves SentryThreadInspector to a class so that it an be initialized from a Swift file. This is a prerequisite for #6274 because the FileIOTracker will also need to be initialized in Swift (and is dependent on SentryThreadInspector)

These need to be moved to the Swift file instead of SentryDependencies.m because in SPM you cannot have Swift code access a Swift type that is forward declared in an objc header. The FileIOTracker has this kind of usage - so it needs to be made accessible from somewhere other than the SentryDependencies.h header.

#skip-changelog

Closes #6406

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.776%. Comparing base (4267263) to head (79a3ac4).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #6404       +/-   ##
=============================================
+ Coverage   86.706%   86.776%   +0.070%     
=============================================
  Files          439       440        +1     
  Lines        37243     37259       +16     
  Branches     17360     17370       +10     
=============================================
+ Hits         32292     32332       +40     
+ Misses        4908      4883       -25     
- Partials        43        44        +1     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryANRTrackingIntegration.m	97.041% <ø> (-1.776%)	⬇️
Sources/Sentry/SentryDefaultThreadInspector.m	98.437% <ø> (ø)
Sources/Sentry/SentryDependencyContainer.m	89.711% <100.000%> (+0.153%)	⬆️
Sources/Sentry/SentryFileIOTracker.m	95.555% <100.000%> (ø)
...rces/Swift/SentryCrash/SentryThreadInspector.swift	100.000% <100.000%> (ø)

... and 17 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1221.00 ms	1256.89 ms	35.89 ms
Size	23.75 KiB	989.12 KiB	965.38 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
2481950	1221.04 ms	1248.98 ms	27.94 ms
3ffd0e5	1228.04 ms	1253.04 ms	25.00 ms
5cbd333	1219.93 ms	1241.76 ms	21.83 ms
5d238d3	1228.94 ms	1253.04 ms	24.10 ms
884b224	1221.11 ms	1255.88 ms	34.77 ms
7f2f69c	1237.61 ms	1266.96 ms	29.35 ms
1fecbb8	1242.78 ms	1265.40 ms	22.62 ms
a9fac2e	1212.45 ms	1219.67 ms	7.22 ms
ea5a59b	1222.87 ms	1253.47 ms	30.60 ms
934eee4	1222.51 ms	1251.04 ms	28.53 ms

App size

Revision	Plain	With Sentry	Diff
2481950	23.74 KiB	872.74 KiB	849.00 KiB
3ffd0e5	23.75 KiB	947.55 KiB	923.80 KiB
5cbd333	23.74 KiB	969.77 KiB	946.02 KiB
5d238d3	23.75 KiB	913.62 KiB	889.88 KiB
884b224	23.75 KiB	879.55 KiB	855.80 KiB
7f2f69c	23.75 KiB	913.38 KiB	889.63 KiB
1fecbb8	23.75 KiB	969.28 KiB	945.53 KiB
a9fac2e	23.75 KiB	879.53 KiB	855.78 KiB
ea5a59b	23.75 KiB	874.46 KiB	850.71 KiB
934eee4	23.75 KiB	988.03 KiB	964.28 KiB

Previous results on branch: moveThreadInspectorToSwift

Startup times

Revision	Plain	With Sentry	Diff
929cddd	1221.74 ms	1253.42 ms	31.68 ms
5034784	1233.00 ms	1267.43 ms	34.43 ms
c18d93a	1231.79 ms	1259.90 ms	28.12 ms

App size

Revision	Plain	With Sentry	Diff
929cddd	23.75 KiB	989.11 KiB	965.36 KiB
5034784	23.75 KiB	989.08 KiB	965.33 KiB
c18d93a	23.75 KiB	989.10 KiB	965.35 KiB