fix: Add Proguard Rules Enforced by Android Gradle Plugin

During the Gradle build process, we encountered missing Proguard
rules specified in the "missing_rules.txt" file. To ensure proper
code shrinking and obfuscation, we have now added these missing
Proguard rules to our project.

Fixes: LEARNER-9482

Author: Hamza Israr

OpenEdXMobile/proguard-rules.pro

@@ -31,3 +31,9 @@
 
 # Keep Rule to hide the original source file name on stack trace
 -renamesourcefileattribute SourceFile
+
+# Rules enforced by Android Gradle plugin.
+-dontwarn com.google.crypto.**
+-dontwarn com.google.protobuf.**
+-dontwarn com.huawei.hms.ads.**
+-dontwarn edu.umd.cs.findbugs.**

gradle.properties

@@ -15,3 +15,4 @@ android.enableJetifier=true
 android.useAndroidX=true
 org.gradle.jvmargs=-Xmx2048M -Dkotlin.daemon.jvm.options\="-Xmx2048M"
 android.nonFinalResIds=false
+android.enableR8.fullMode=false