perf: Reduce reflection cost during SDK init (Init Reflection stack)

[runningcode]

PR Stack (Init Reflection)

• perf: Reduce reflection cost during SDK init (Init Reflection stack) #5634 — collection
• perf(core): [Init Reflection 1] Probe class availability without initializing #5635 — [1] Probe class availability without initializing
• perf(core): [Init Reflection 2] Cache class lookups and collapse double probes #5636 — [2] Cache class lookups and collapse double probes
• perf(android): [Init Reflection 3] Gate Compose class probes behind their features #5637 — [3] Gate Compose class probes behind their features

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Part of JAVA-587

Collection PR for the Init Reflection stack — reducing the reflection cost on the SentryAndroid.init path (found via the customer-provided Perfetto trace in the Reduce SDK init time [Android] project).

Squash-merge this once all stack PRs below are merged into it.

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- Reduce reflection cost during SDK init (Init Reflection stack) ([#5634](https://github.com/getsentry/sentry-java/pull/5634))

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Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.45.0 (1)	release

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[linear-code]

JAVA-587