feat(snapshot): Add Compose preview snapshot testing plugin

[runningcode]

Summary

• Add io.sentry.android.snapshot standalone Gradle plugin that automatically generates Paparazzi snapshot tests for all @Preview composables
• Uses two-pass ASM bytecode scanning at build time to discover @Preview methods (including custom multi-preview annotations like @PreviewLightDark, @PreviewScreenSizes, etc.)
• Generates a parameterized JUnit test that invokes each composable via reflection through Paparazzi
• Supports both direct @Preview annotations, container annotations (@Previews), and custom meta-annotations

Architecture

compileDebugKotlin
        │
        ▼
sentryScanPreviewsDebug (two-pass ASM scan → previewConfigs.json)
        │
        ▼
testDebugUnitTest (Paparazzi)
  └── SentrySnapshotTest.kt (reads JSON, invokes previews via reflection)

Usage

Applied as a standalone plugin (requires Paparazzi):

plugins {
    id("io.sentry.android.snapshot")
    id("app.cash.paparazzi")
}

sentry {
  snapshots {
    // optional:
    // includePrivatePreviews.set(true)
    // variant.set("debug")
  }
}

./gradlew recordPaparazziDebug    # Record golden snapshots
./gradlew verifyPaparazziDebug    # Verify against goldens

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[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

---

New Features ✨

• (snapshot) Add Compose preview snapshot testing plugin by runningcode in #1083

• (snapshots) Wire VCS extension to snapshots upload task by runningcode in #1102

Internal Changes 🔧

Deps

• Update Android SDK to v8.35.0 by github-actions in #1104
• Bump getsentry/craft from 2.23.1 to 2.24.1 by dependabot in #1103
• Bump dorny/paths-filter from 3.0.2 to 4.0.0 by dependabot in #1106
• Update CLI to v3.3.3 by github-actions in #1101

---

_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

### Features

- Add Compose preview snapshot testing plugin ([#1083](https://github.com/getsentry/sentry-android-gradle-plugin/pull/1083))

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