fix: Resolve compilation error in video streaming feature

This change addresses a compilation error that occurred after introducing the video streaming functionality. The `LiveSession.kt` file was missing an import for `android.Manifest`, which resulted in an "Unresolved reference" error during the build process.

This commit adds the necessary `import android.Manifest` statement to `LiveSession.kt`, resolving the compilation issue.

Author: google-labs-jules[bot]

firebase-ai/src/main/kotlin/com/google/firebase/ai/type/LiveSession.kt

@@ -16,6 +16,7 @@
 
 package com.google.firebase.ai.type
 
+import android.Manifest
 import android.Manifest.permission.RECORD_AUDIO
 import android.content.pm.PackageManager
 import android.media.AudioFormat