feat(source-context): Include sources from library modules

[runningcode]

Summary

• Source context was only collected from the app module. Stack traces from library module code had no source context in Sentry.
• Adds support for collecting sources from all transitive local project dependencies using Gradle's consumable/resolvable configuration pattern (Project Isolation compatible).
• Two setup paths: apply io.sentry.android.gradle to library modules directly, or apply the new io.sentry.android.gradle.settings settings plugin to auto-configure all library modules.

How it works

Library side: A consumable sentrySourceElements configuration publishes src/main/java and src/main/kotlin as artifacts with a custom attribute (io.sentry.artifact = sentry-sources).

App side: When includeSourceContext = true, a resolvable configuration inherits the same dependency scopes as RuntimeClasspath and resolves source directories from dependency libraries via attribute matching with lenient(true).

User experience

// Option A: Apply plugin to library modules
// library/build.gradle.kts
plugins {
    id("com.android.library")
    id("io.sentry.android.gradle")
}

// Option B: Use settings plugin (auto-configures all library modules)
// settings.gradle.kts
plugins {
    id("io.sentry.android.gradle.settings")
}

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[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

- Include sources from library modules ([#1177](https://github.com/getsentry/sentry-android-gradle-plugin/pull/1177))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description or adding a skip-changelog label.

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