Reduce main thread work on init

[stefanosiano]

📜 Description

Moved old profiles deletion to the background
moved some Integration.register() to the background using executorService
added tests

💡 Motivation and Context

This is an attempt to improve SDK startup timing.
Relates to #2222

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	386.71 ms	465.34 ms	78.63 ms
Size	1.72 MiB	2.29 MiB	579.13 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
0404ea3	332.47 ms	401.12 ms	68.66 ms
86f0096	371.86 ms	439.78 ms	67.92 ms
99a51e2	405.11 ms	479.65 ms	74.54 ms
4e29063	384.14 ms	447.74 ms	63.60 ms
93a76ca	377.41 ms	448.22 ms	70.81 ms
2fad834	390.07 ms	470.80 ms	80.73 ms
4bf95dd	345.96 ms	414.24 ms	68.28 ms
0404ea3	394.73 ms	461.79 ms	67.06 ms
0bd723b	395.44 ms	472.66 ms	77.22 ms
bc4be3b	360.40 ms	435.04 ms	74.64 ms

App size

Revision	Plain	With Sentry	Diff
0404ea3	1.72 MiB	2.29 MiB	577.52 KiB
86f0096	1.72 MiB	2.29 MiB	576.50 KiB
99a51e2	1.72 MiB	2.29 MiB	576.34 KiB
4e29063	1.72 MiB	2.29 MiB	578.38 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
2fad834	1.72 MiB	2.29 MiB	577.53 KiB
4bf95dd	1.72 MiB	2.29 MiB	576.40 KiB
0404ea3	1.72 MiB	2.29 MiB	577.52 KiB
0bd723b	1.72 MiB	2.29 MiB	578.09 KiB
bc4be3b	1.72 MiB	2.29 MiB	576.53 KiB

Previous results on branch: fix/reduce-io-init

Startup times

Revision	Plain	With Sentry	Diff
2462226	400.98 ms	477.18 ms	76.20 ms
077a103	410.41 ms	464.64 ms	54.24 ms
5295259	376.14 ms	448.89 ms	72.75 ms
5c39a33	294.54 ms	327.67 ms	33.12 ms
644ca6a	448.52 ms	547.22 ms	98.70 ms

App size

Revision	Plain	With Sentry	Diff
2462226	1.72 MiB	2.29 MiB	578.43 KiB
077a103	1.72 MiB	2.29 MiB	578.27 KiB
5295259	1.72 MiB	2.29 MiB	577.94 KiB
5c39a33	1.72 MiB	2.29 MiB	579.27 KiB
644ca6a	1.72 MiB	2.29 MiB	578.27 KiB

[markushi]

Looking good, I left a few comments which need to be addressed before merging. 🚀

[markushi]

LGTM!