feat: Integrate AttributionId Flow

[LoyalAbbas]

Add androidx.startup:startup-runtime and a startup initializer to track sample repository usage. Uses androidx.startup.InitializationProvider for lightweight, automatic initialization on app startup.

[googlemaps-bot]

Code Coverage

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[kikoso]

Review

[kikoso]

One more note that could not be anchored to a diff line since library/consumer-rules.keep is an empty new file:

library/consumer-rules.keep is created but never wired up. library/build.gradle.kts's defaultConfig block does not call consumerProguardFiles("consumer-rules.keep"), unlike places-compose/build.gradle.kts which does this for its own consumer-rules.pro. If keep rules are added here later, for example to protect the reflectively loaded AttributionIdInitializer (referenced by class name in AndroidManifest.xml for androidx.startup) from R8 stripping in minified consumer apps, they will silently have no effect. The nonstandard .keep extension, versus the project's established .pro convention, suggests this hookup was simply forgotten.

[kikoso]

Review notes

[kikoso]

androidTestImplementation(libs.androidx.espresso.core) and androidx.junit are declared here, but this module has no src/androidTest source set. These dependencies resolve and download for no benefit until an androidTest source set actually exists. Consider removing them until they're needed.

[kikoso]

coreKtxVersion (1.7.0, backing androidx.test:core-ktx) is easy to confuse with the pre-existing coreKtx (1.18.0, backing androidx.core:core-ktx) a few lines above. A future dependency bump could edit the wrong key by mistake. Consider a more distinct name, e.g. androidxTestCoreKtx.

[kikoso]

LGTM