Make SDK unity-compatible

[romtsn]

📜 Description

Since sentry-unity consumes Android SDK artifacts decoupled from each other (e.g. sentry.jar and sentry-android-core.aar do not know about each other), some versions of Unity cannot properly desugar default methods in interfaces during build time.

This results in runtime errors when a default method from sentry.jar is called in sentry-android-core.aar. We've tried to work this around by properly consuming android artifacts using local maven (#2725), but this turned out to be a nightmare to support, because we modify gradle build files via regexes on sentry-unity.

This PR simply converts all default methods that are used in sentry-android-core to be non-default (meaning proper implementations in each interface implementor).

💡 Motivation and Context

@bitsandfoxes mental well-being

💚 How did you test it?

Manually and automated

📝 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

[romtsn]

The only problem is that this change is binary-incompatible, so if someone is using an older integration version (e.g. sentry-android-timber:6.24.0), and we ship this but they don't update and align the sentry versions, it will crash at runtime. So I'm leaning towards making it a part of v7.0.0 (this shouldn't take longer than 2-3 weeks @bitsandfoxes I hope this should be fine for you?).

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	342.04 ms	391.65 ms	49.61 ms
Size	1.72 MiB	2.26 MiB	547.63 KiB

Previous results on branch: rz/fix/interface-default-methods-in-core

Startup times

Revision	Plain	With Sentry	Diff
f5fba9d	350.57 ms	407.30 ms	56.73 ms

App size

Revision	Plain	With Sentry	Diff
f5fba9d	1.72 MiB	2.26 MiB	547.63 KiB

[codecov]

Codecov Report

Patch coverage is 66.29% of modified lines.

Files Changed	Coverage
.../main/java/io/sentry/android/core/ANRWatchDog.java	ø
...n/java/io/sentry/android/ndk/NdkScopeObserver.java	ø
...ntry/android/sqlite/SentrySupportSQLiteDatabase.kt	ø
...n/kotlin/io/sentry/compose/SentryComposeTracing.kt	0.00%
...try/spring/boot/jakarta/InAppIncludesResolver.java	ø
...y/spring/boot/jakarta/SentryAutoConfiguration.java	0.00%
...akarta/SentryLogbackAppenderAutoConfiguration.java	ø
.../spring/boot/jakarta/SentryLogbackInitializer.java	ø
...o/sentry/spring/boot/jakarta/SentryProperties.java	ø
...boot/jakarta/SentrySpanRestTemplateCustomizer.java	ø
... and 108 more

📢 Thoughts on this report? Let us know!.

[stefanosiano]

looks great!
just a note, though. The public interfaces that were changed are technically a breaking change. A note in the changelog is enough, as it will be part of v7 anyway