Specifically mark native methods to keep (#893)

* Specifically mark native methods to keep

* changeset

Author: davidliu

.changeset/sweet-poems-travel.md

@@ -0,0 +1,5 @@
+---
+"client-sdk-android": patch
+---
+
+Specifically keep native libwebrtc methods from being obfuscated

livekit-android-sdk/consumer-rules.pro

@@ -20,7 +20,12 @@
 
 # WebRTC
 #########################################
-# Ensure java methods called from Native are preserved.
+# Ensure JNI native method names and descriptors are preserved (Java -> native).
+-keepclasseswithmembernames,includedescriptorclasses class livekit.org.webrtc.** {
+    native <methods>;
+}
+
+# Ensure java methods called from Native are preserved (native -> Java).
 -keepclasseswithmembers,includedescriptorclasses class * {
     @livekit.**.CalledByNative <methods>;
 }