[FSSDK-11888] fix: disable code minify to support R8 compatibility (#87)

* build: update minifyEnabled setting in release build

- Change minifyEnabled from true to false in the release buildType
- Update the ProGuard configuration to exclude javax.mail and javax.activation. classes

* chore: update ProGuard rules

- Keep necessary classes for Optimizely and Jackson libraries
- Keep Logback classes
- Remove unnecessary warnings for javax.mail classes
- Add ProGuard configuration to build.gradle for minification
- Update proguard-rules.txt in app folder

* build: enable resource shrinking in release build

- Add configuration to shrink resources for reducing APK size

* chore: update build configuration

- Remove 'minifyEnabled' setting from release build type in android/build.gradle
- Exclude javax.mail and javax.activation classes in proguard configuration
- Delete deprecated mail classes warning in proguard-rules.txt

Author: muzahidul-opti

android/build.gradle

@@ -56,14 +56,6 @@ android {
     packagingOptions {
         exclude 'androidsupportmultidexversion.txt'
     }
-
-    buildTypes {
-        release {
-            minifyEnabled true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-        }
-    }
-
 }
 
 dependencies {

android/proguard-rules.txt

@@ -12,4 +12,10 @@
 -keep class com.fasterxml.jackson.** {*;}
 # Logback
 -keep class ch.qos.** { *; }
+
+# Mail classes (Logback SMTP appender)
+-dontwarn javax.mail.**
+-dontwarn javax.mail.internet.**
+-dontwarn javax.activation.**
+
 ##---------------End: proguard configuration ----------