[ItsChaceD]

Description

Adds firebase-components 18.0.1's keep rule to the plugin's proguard-rules.pro, and wires the file through consumerProguardFiles and files so it reaches apps.

ML Kit barcode scanning 17.3.0 brings firebase-components 16.1.0, whose own rule keeps ComponentRegistrar classes but not their constructors. AGP 9 no longer keeps those, so with R8 on ML Kit's components fail to register and decoding throws.

Tested on Capacitor 9.0.0-alpha.8 with R8 on, in an app where this is the only ML Kit or Firebase user. ML Kit decodes a QR code as with R8 off. With next, three registrars fail to load and decoding throws a NullPointerException.

Logs

With next:

W ComponentDiscovery: Could not instantiate com.google.mlkit.common.internal.CommonComponentRegistrar
W ComponentDiscovery: Could not instantiate com.google.mlkit.vision.barcode.internal.BarcodeRegistrar
W ComponentDiscovery: Could not instantiate com.google.mlkit.vision.common.internal.VisionCommonRegistrar

With this branch:

ML Kit decode of a generated QR code -> "RMET-QR-1"

Change Type

• Fix
• Feature
• Refactor
• Breaking Change
• Documentation
• Other (CI, chores, etc.)

Rationale / Problems Fixed

https://outsystemsrd.atlassian.net/browse/RMET-5542

Platforms Affected

• Android
• iOS
• Web

Notes

The rule does nothing once firebase-components 18.0.1 or later is resolved.