[HUDI-1089] Refactor hudi-client to support multi-engine (#1827)

- This change breaks `hudi-client` into `hudi-client-common` and `hudi-spark-client` modules 
- Simple usages of Spark using jsc.parallelize() has been redone using EngineContext#map, EngineContext#flatMap etc
- Code changes in the PR, break classes into `BaseXYZ` parent classes with no spark dependencies living in `hudi-client-common`
- Classes on `hudi-spark-client` are named `SparkXYZ` extending the parent classes with all the Spark dependencies
- To simplify/cleanup, HoodieIndex#fetchRecordLocation has been removed and its usages in tests replaced with alternatives

Co-authored-by: Vinoth Chandar <vinoth@apache.org>

hudi-client/hudi-client-common/src/test/resources/exampleEvolvedSchema.txt

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+{
+    "namespace": "example.schema",
+    "type": "record",
+    "name": "trip",
+    "fields": [
+        {
+            "name": "number",
+            "type": ["int", "null"]
+        },
+        {
+            "name": "time",
+            "type": "string"
+        },
+        {
+            "name": "_row_key",
+            "type": "string"
+        },
+        {
+            "name": "added_field",
+            "type": ["int", "null"]
+        }
+    ]
+}