profiling: new continuous profiling API

[armcknight]

This is an epic feature branch draft PR, into which other branches will be merged for the duration of the work to introduce the changes in #4851

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1229.65 ms	1252.16 ms	22.51 ms
Size	22.30 KiB	823.44 KiB	801.13 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ab0012c	1209.06 ms	1228.78 ms	19.72 ms
825f0cb	1220.53 ms	1236.18 ms	15.65 ms
ae9c51b	1244.85 ms	1264.33 ms	19.47 ms
8aec30e	1249.29 ms	1252.63 ms	3.35 ms
b9fc537	1219.69 ms	1231.80 ms	12.12 ms
dbb4b19	1246.02 ms	1259.87 ms	13.85 ms
9202018	1225.77 ms	1250.06 ms	24.29 ms
e887ddc	1234.71 ms	1244.22 ms	9.50 ms
866c529	1223.76 ms	1244.27 ms	20.52 ms
fff4a70	1236.59 ms	1249.11 ms	12.52 ms

App size

Revision	Plain	With Sentry	Diff
ab0012c	22.85 KiB	415.09 KiB	392.24 KiB
825f0cb	22.31 KiB	771.42 KiB	749.10 KiB
ae9c51b	22.85 KiB	411.13 KiB	388.28 KiB
8aec30e	21.58 KiB	616.76 KiB	595.18 KiB
b9fc537	21.58 KiB	676.19 KiB	654.61 KiB
dbb4b19	22.30 KiB	750.03 KiB	727.73 KiB
9202018	22.30 KiB	749.70 KiB	727.40 KiB
e887ddc	21.58 KiB	616.76 KiB	595.18 KiB
866c529	22.31 KiB	780.84 KiB	758.53 KiB
fff4a70	21.58 KiB	707.28 KiB	685.70 KiB

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.498%. Comparing base (c964075) to head (c8e496f).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4952       +/-   ##
=============================================
+ Coverage   92.470%   92.498%   +0.028%     
=============================================
  Files          666       666               
  Lines        78926     78933        +7     
  Branches     28572     28592       +20     
=============================================
+ Hits         72983     73012       +29     
+ Misses        5845      5823       -22     
  Partials        98        98               

see 17 files with indirect coverage changes

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