Write the proguard uuid to the Android manifest

[bruno-garcia]

Description

To avoid reading the sentry-debug-meta.properties at runtime, given that the manifest properties are anyway always read. Change the plugin so it writes the proguard uuid into the android manifest.

Please note this GHA needs to be amended:

https://github.com/getsentry/sentry-android-gradle-plugin/blob/2b424323a82f39c3a5658b4b51dc1762ce4887b8/.github/workflows/test-publish-dry-run.yaml#L63-L66

[markushi]

Should be done together with #308

[markushi]

Let's come back to this later once we know how many people are actually using the manifest init method.