Tracing: added customizable precision level.

Author: wprzytula

driver-core/src/main/java/com/datastax/driver/core/tracing/PrecisionLevel.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2021 ScyllaDB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.datastax.driver.core.tracing;
+
+/** The precision level of tracing data that is to be collected. May be extended in the future. */
+public enum PrecisionLevel {
+  // Enum elements must be listed in ascending order of precision level (i.e. each next element
+  // listed adds some new information).
+  NORMAL,
+  FULL;
+}