build: update Android build system and platform compatibility

1. Gradle ecosystem upgrades:
   - Update Gradle from 8.1 to 8.12
   - Update Android Gradle plugin from 8.1.2 to 8.10.0
   - Upgrade Java compatibility from 17 to 21

2. Build configuration changes:
   - Make release build the default instead of relWithDebInfo
   - Enable premium features

3. Platform compatibility fixes:
   - Properly exclude boost-process on Android
   - Add workarounds for missing features on Android
   - Fix socket operations in SSL backend
   - Update Boost.Asio naming (io_service → io_context)

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
-#Sun Feb 21 18:16:59 EST 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip