chore: add debug util for printing protobuf messages

Author: bevzzz

src/main/java/io/weaviate/client6/v1/internal/Debug.java

@@ -0,0 +1,27 @@
+package io.weaviate.client6.v1.internal;
+
+import com.google.protobuf.InvalidProtocolBufferException;
+import com.google.protobuf.MessageOrBuilder;
+import com.google.protobuf.util.JsonFormat;
+
+/** Debug utilities. */
+public final class Debug {
+  public static final void printProto(Object proto) {
+    System.out.println(proto2json((MessageOrBuilder) proto));
+  }
+
+  public static final void printProto(Object proto, String message, Object... args) {
+    System.out.println(message.formatted(args) + ": " + proto2json((MessageOrBuilder) proto));
+  }
+
+  private static final String proto2json(MessageOrBuilder proto) {
+    String out;
+    try {
+      out = JsonFormat.printer().print(proto);
+    } catch (InvalidProtocolBufferException e) {
+      out = e.getMessage();
+    }
+
+    return out;
+  }
+}