OZG-1518 OZG-1930 revert GrpcUtil due to ITCase problems

goofy-server/src/main/java/de/itvsh/goofy/common/GrpcUtil.java

+package de.itvsh.goofy.common;
+
+import io.grpc.Metadata;
+import io.grpc.Metadata.Key;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class GrpcUtil {
+
+	public static Key<String> createKeyOf(String key) {
+		return Key.of(key, Metadata.ASCII_STRING_MARSHALLER);
+	}
+}
\ No newline at end of file

goofy-server/src/main/java/de/itvsh/goofy/common/callcontext/CallContextAttachingInterceptor.java

@@ -3,7 +3,7 @@ package de.itvsh.goofy.common.callcontext;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import de.itvsh.goofy.common.ContextService;
-import de.itvsh.kop.common.grpc.GrpcUtil;
+import de.itvsh.goofy.common.GrpcUtil;
 import io.grpc.CallOptions;
 import io.grpc.Channel;
 import io.grpc.ClientCall;