Fixed data tracks failing to load in apps minified with R8

The data track bindings call Rust through JNA. libjnidispatch resolves JNA's
classes and fields by name, and JNA reads the bindings' Structure and Callback
subclasses reflectively, but neither JNA nor livekit-uniffi-android ships keep
rules, so R8 renamed or stripped them and the native library failed to load.
Added the rules from JNA's FAQ to the consumer rules.

Author: adrian-niculescu

.changeset/keep-jna-for-data-tracks.md

@@ -0,0 +1,5 @@
+---
+"client-sdk-android": patch
+---
+
+Fixed data tracks failing to load in apps minified with R8.

livekit-android-sdk/consumer-rules.pro

@@ -48,3 +48,13 @@
 -keepclassmembers class com.google.protobuf.** extends com.google.protobuf.GeneratedMessageLite {
   <fields>;
 }
+
+# JNA (UniFFI data track bindings)
+#########################################
+# libjnidispatch looks up JNA's classes and fields by name, and JNA reads the bindings'
+# Structure and Callback subclasses reflectively. livekit-uniffi-android ships no rules for
+# either. These are the rules from JNA's FAQ.
+-dontwarn java.awt.*
+-keep class com.sun.jna.* { *; }
+-keep class * extends com.sun.jna.* { *; }
+-keepclassmembers class * extends com.sun.jna.* { public *; }