feat: Update fields from discovery doc change (#36)

PiperOrigin-RevId: 889300570

Co-authored-by: Matthew Tang <tangmatthew@google.com>

Author: copybara-service[bot]

google-cloud-vertexai/src/main/java/com/google/cloud/vertexai/genai/types/EventMetadata.java

@@ -25,6 +25,7 @@
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.genai.JsonSerializable;
 import com.google.genai.types.GroundingMetadata;
+import com.google.genai.types.Transcription;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
@@ -78,6 +79,14 @@ public abstract class EventMetadata extends JsonSerializable {
   @JsonProperty("turnComplete")
   public abstract Optional<Boolean> turnComplete();
 
+  /** Optional. Audio transcription of user input. */
+  @JsonProperty("inputTranscription")
+  public abstract Optional<Transcription> inputTranscription();
+
+  /** Optional. Audio transcription of model output. */
+  @JsonProperty("outputTranscription")
+  public abstract Optional<Transcription> outputTranscription();
+
   /** Instantiates a builder for EventMetadata. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -241,6 +250,42 @@ public Builder clearTurnComplete() {
       return turnComplete(Optional.empty());
     }
 
+    /**
+     * Setter for inputTranscription.
+     *
+     * <p>inputTranscription: Optional. Audio transcription of user input.
+     */
+    @JsonProperty("inputTranscription")
+    public abstract Builder inputTranscription(Transcription inputTranscription);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder inputTranscription(Optional<Transcription> inputTranscription);
+
+    /** Clears the value of inputTranscription field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearInputTranscription() {
+      return inputTranscription(Optional.empty());
+    }
+
+    /**
+     * Setter for outputTranscription.
+     *
+     * <p>outputTranscription: Optional. Audio transcription of model output.
+     */
+    @JsonProperty("outputTranscription")
+    public abstract Builder outputTranscription(Transcription outputTranscription);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder outputTranscription(Optional<Transcription> outputTranscription);
+
+    /** Clears the value of outputTranscription field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearOutputTranscription() {
+      return outputTranscription(Optional.empty());
+    }
+
     public abstract EventMetadata build();
   }