Drop dependency upon EventBus library

Migrate to sharedflow instead which are built within kotlin to
avoid an external dependency

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/proguard-rules.pro

@@ -91,17 +91,6 @@
 -if interface * { @retrofit2.http.* <methods>; }
 -keep,allowobfuscation interface <1>
 
-#Event Bus
--keepattributes *Annotation*
--keepclassmembers class * {
-   @org.greenrobot.eventbus.Subscribe <methods>;
-}
--keep enum org.greenrobot.eventbus.ThreadMode { *; }
-
--keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {
-    <init>(java.lang.Throwable);
-}
-
 -keepclassmembers enum * { *; }
 -keep class  com.aurora.store.view.ui.preferences.**
 -dontwarn  com.aurora.store.view.ui.preferences.**