Add TURN WRAP support for Android client

[Haeniken]

Summary

Adds TURN WRAP support to the Android client.

This lets Android import and run vk-turn-proxy profiles that use WRAP encryption over DTLS, matching the server-side -wrap / -wrap-key mode.

Changes

• Added UseWrap and WrapKeyHex TURN config fields.
• Added import/export support via WireGuard config comments:
  • #@wgt:UseWrap = true
  • #@wgt:WrapKeyHex = <64-hex-key>
• Added Android UI controls for enabling WRAP and entering the WRAP key.
• Persisted WRAP settings in TurnSettingsStore.
• Passed WRAP settings through Kotlin → Java → JNI → Go.
• Implemented WRAP packet wrapping/unwrapping in the Go TURN client.
• Validated WRAP usage:
  • requires DTLS mode
  • rejects wireguard/no-DTLS mode
  • requires a 64-character hex key
• Bumped app version to 2.2.21.
• Fixed release APK rename path in the release workflow.

Testing

• Built successfully with GitHub Actions
• Generated and imported Android WRAP profiles
• Verified WRAP connection works against existing vk-turn-proxy WRAP server.

[Haeniken]

Будет работать с серверной стороной https://github.com/Moroka8/vk-turn-proxy

Также PR для серверной стороны kiper292/vk-turn-proxy#3