feat: Add ChannelPoolSettings Getter for gRPC's ChannelProvider

gax-java/gax-grpc/src/main/java/com/google/api/gax/grpc/InstantiatingGrpcChannelProvider.java

@@ -473,6 +473,11 @@ public Integer getMaxInboundMetadataSize() {
  return maxInboundMetadataSize;
  }
 
+ /** The configured channel pool settings used for gRPC's ChannelProvider */
+ public ChannelPoolSettings getChannelPoolSettings() {
+ return channelPoolSettings;
+ }
+
  @Override
  public boolean shouldAutoClose() {
  return true;