[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-integ-test/src/test/java/org/apache/hudi/integ/testsuite/reader/TestDFSHoodieDatasetInputReader.java

@@ -26,8 +26,9 @@ import java.util.List;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericRecord;
 import org.apache.hudi.avro.HoodieAvroUtils;
-import org.apache.hudi.client.HoodieWriteClient;
+import org.apache.hudi.client.SparkRDDWriteClient;
 import org.apache.hudi.client.WriteStatus;
+import org.apache.hudi.client.common.HoodieSparkEngineContext;
 import org.apache.hudi.common.model.HoodieRecord;
 import org.apache.hudi.common.testutils.HoodieTestDataGenerator;
 import org.apache.hudi.common.testutils.HoodieTestUtils;
@@ -70,7 +71,7 @@ public class TestDFSHoodieDatasetInputReader extends UtilitiesTestBase {
   public void testSimpleHoodieDatasetReader() throws Exception {
 
     HoodieWriteConfig config = makeHoodieClientConfig();
-    HoodieWriteClient client = new HoodieWriteClient(jsc, config);
+    SparkRDDWriteClient client = new SparkRDDWriteClient(new HoodieSparkEngineContext(jsc), config);
     String commitTime = client.startCommit();
     HoodieTestDataGenerator generator = new HoodieTestDataGenerator();
     // Insert 100 records across 3 partitions