add initialization functions

Author: VinayGuthal

firebase-ai/src/main/kotlin/com/google/firebase/ai/java/LiveSessionFutures.kt

@@ -68,6 +68,7 @@ public abstract class LiveSessionFutures internal constructor() {
   @RequiresPermission(RECORD_AUDIO)
   public abstract fun stopAudioConversation(): ListenableFuture<Unit>
 
+
   /**
    * Stops receiving from the model.
    *

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

@@ -219,6 +219,10 @@ public class AudioRecordInitializationFailedException(message: String) :
 public class ServiceConnectionHandshakeFailedException(message: String, cause: Throwable? = null) :
   FirebaseAIException(message, cause)
 
+/** The request is missing a permission that is required to perform the requested operation. */
+public class PermissionMissingException(message: String, cause: Throwable? = null) :
+  FirebaseAIException(message, cause)
+
 /** Catch all case for exceptions not explicitly expected. */
 public class UnknownException internal constructor(message: String, cause: Throwable? = null) :
   FirebaseAIException(message, cause)

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

@@ -131,6 +131,17 @@ internal constructor(
     }
   }
 
+
+  /**
+   * Indicates whether the underlying websocket connection is active.
+   */
+  public fun isActive(): Boolean = session.isActive
+
+  /**
+   * Indicates whether an audio conversation is being used for this session object.
+   */
+  public fun isAudioConversationRunning(): Boolean = (audioHelper == null)
+
   /**
    * Receives responses from the model for both streaming and standard requests.
    *