Fix account provider change on nightly and release (#861)

* Use parallelMap (same code)

* Add proguard rules. Fixes #818

* Rename file proguard-rules.pro to consumer-rules.pro for coherency.

* Remove empty and non-referenced proguard files.

libraries/network/build.gradle.kts

@@ -20,6 +20,13 @@ plugins {
 
 android {
     namespace = "io.element.android.libraries.network"
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            consumerProguardFiles("consumer-rules.pro")
+        }
+    }
 }
 
 anvil {