Make explicit we want to keep the member names too, but we want to allow optimization of the code and shrinking when methods aren't used

Author: jmartinesp

app/proguard-rules.pro

@@ -69,4 +69,4 @@
 -keep class org.matrix.rustcomponents.sdk.** { *;}
 -keep class uniffi.** { *;}
 -keep class io.element.android.x.di.** { *; }
--keepnames class io.element.android.**
+-keepclasseswithmembernames,allowoptimization,allowshrinking class io.element.android.** { *; }