Add enableScopePersistence option

[romtsn]

📜 Description

For now PersistingScopeObserver is used only for ANRv2, but it's generic enough that we can use it for other features (e.g. to address #547), hence we're introducing a new flag to disable scope persistence separately.

We should also think how to improve its performance see #3168

💡 Motivation and Context

Part of getsentry/sentry-unity#1555

💚 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	376.58 ms	430.94 ms	54.36 ms
Size	1.70 MiB	2.28 MiB	587.91 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
4bf95dd	345.96 ms	414.24 ms	68.28 ms
95a98b5	380.06 ms	453.56 ms	73.50 ms
2465853	400.64 ms	465.47 ms	64.83 ms
7ab32b6	373.62 ms	480.61 ms	106.99 ms
2fad834	390.07 ms	470.80 ms	80.73 ms
1f3652d	361.62 ms	424.76 ms	63.14 ms
937879e	400.98 ms	482.84 ms	81.86 ms
4e29063	376.38 ms	390.98 ms	14.60 ms
4e260b3	388.40 ms	468.98 ms	80.58 ms
86f0096	368.63 ms	446.92 ms	78.29 ms

App size

Revision	Plain	With Sentry	Diff
4bf95dd	1.72 MiB	2.29 MiB	576.40 KiB
95a98b5	1.70 MiB	2.27 MiB	586.31 KiB
2465853	1.70 MiB	2.27 MiB	583.82 KiB
7ab32b6	1.70 MiB	2.27 MiB	584.63 KiB
2fad834	1.72 MiB	2.29 MiB	577.53 KiB
1f3652d	1.72 MiB	2.27 MiB	554.95 KiB
937879e	1.72 MiB	2.27 MiB	558.42 KiB
4e29063	1.72 MiB	2.29 MiB	578.38 KiB
4e260b3	1.72 MiB	2.27 MiB	554.95 KiB
86f0096	1.72 MiB	2.29 MiB	576.50 KiB

Previous results on branch: rz/feat/scope-persistence-option

Startup times

Revision	Plain	With Sentry	Diff
d43591d	367.04 ms	451.84 ms	84.80 ms
b0eb9b4	402.20 ms	481.29 ms	79.09 ms

App size

Revision	Plain	With Sentry	Diff
d43591d	1.70 MiB	2.28 MiB	587.91 KiB
b0eb9b4	1.70 MiB	2.28 MiB	587.88 KiB

[markushi]

LGTM!