ref: Make SentryTracer sub class of SentrySpan

[brustolin]

SentryTracer is the core of performance, and it gets bigger and bigger with each new feature, therefore is getting harder to understand it.

This is the first step to reduce it. The goal in the future is to extract more behavior from it and use DI as replacement.

#skip-changelog

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1234.12 ms	1241.88 ms	7.76 ms
Size	20.76 KiB	420.41 KiB	399.65 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
9faf217	1268.86 ms	1274.82 ms	5.96 ms
4977fbc	1231.55 ms	1239.80 ms	8.25 ms
156e771	1228.06 ms	1242.64 ms	14.58 ms
83d2d84	1211.31 ms	1227.34 ms	16.03 ms
302ee8b	1194.02 ms	1223.34 ms	29.32 ms
15b8c61	1223.16 ms	1244.83 ms	21.67 ms
4c00f8c	1231.62 ms	1237.76 ms	6.14 ms
1bd0055	1207.57 ms	1223.10 ms	15.53 ms
e71cf92	1201.69 ms	1226.52 ms	24.83 ms
dc0db9e	1222.10 ms	1240.90 ms	18.80 ms

App size

Revision	Plain	With Sentry	Diff
9faf217	20.76 KiB	419.70 KiB	398.94 KiB
4977fbc	20.76 KiB	419.86 KiB	399.10 KiB
156e771	20.76 KiB	419.70 KiB	398.94 KiB
83d2d84	20.76 KiB	419.66 KiB	398.90 KiB
302ee8b	20.76 KiB	419.62 KiB	398.87 KiB
15b8c61	20.76 KiB	419.67 KiB	398.91 KiB
4c00f8c	20.76 KiB	419.62 KiB	398.86 KiB
1bd0055	20.76 KiB	420.22 KiB	399.46 KiB
e71cf92	20.76 KiB	419.85 KiB	399.10 KiB
dc0db9e	20.76 KiB	419.62 KiB	398.86 KiB

Previous results on branch: ref/sentrytracer

Startup times

Revision	Plain	With Sentry	Diff
285cf09	1232.33 ms	1238.46 ms	6.13 ms
32ba1e7	1233.82 ms	1255.69 ms	21.88 ms

App size

Revision	Plain	With Sentry	Diff
285cf09	20.76 KiB	420.40 KiB	399.64 KiB
32ba1e7	20.76 KiB	420.40 KiB	399.64 KiB

[codecov]

Codecov Report

Merging #2675 (05a1472) into main (8674267) will increase coverage by 0.09%.
The diff coverage is 92.10%.

❗ Current head 05a1472 differs from pull request most recent head 0543c2f. Consider uploading reports for the commit 0543c2f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2675      +/-   ##
==========================================
+ Coverage   80.51%   80.60%   +0.09%     
==========================================
  Files         247      247              
  Lines       22962    22862     -100     
  Branches    10154    10127      -27     
==========================================
- Hits        18487    18428      -59     
+ Misses       4008     3858     -150     
- Partials      467      576     +109     

Impacted Files	Coverage Δ
Sources/Sentry/SentryTracer.m	97.04% <90.32%> (+1.57%)	⬆️
Sources/Sentry/SentrySpan.m	97.98% <100.00%> (+12.46%)	⬆️
Sources/Sentry/SentryTime.mm	68.00% <0.00%> (-20.00%)	⬇️
Sources/Sentry/SentryRequestOperation.m	67.56% <0.00%> (-10.82%)	⬇️
...ryCrash/Recording/Tools/SentryCrashDynamicLinker.c	79.77% <0.00%> (-0.08%)	⬇️
Sources/Sentry/SentryDevice.mm	53.09% <0.00%> (ø)
Sources/Sentry/SentryProfiler.mm	79.48% <0.00%> (ø)
Sources/Sentry/SentryScreenshot.m	73.52% <0.00%> (ø)
Sources/Sentry/SentryCrashWrapper.m	84.31% <0.00%> (ø)
... and 25 more

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[philipphofmann]

LGTM, thanks for the refactoring @brustolin.