[HUDI-2443] Hudi KVComparator for all HFile writer usages (#3889)

* [HUDI-2443] Hudi KVComparator for all HFile writer usages

- Hudi relies on custom class shading for Hbase's KeyValue.KVComparator to
  avoid versioning and class loading issues. There are few places which are
  still using the Hbase's comparator class directly and version upgrades
  would make them obsolete. Refactoring the HoodieKVComparator and making
  all HFile writer creation using the same shaded class.

* [HUDI-2443] Hudi KVComparator for all HFile writer usages

- Moving HoodieKVComparator from common.bootstrap.index to common.util

* [HUDI-2443] Hudi KVComparator for all HFile writer usages

- Retaining the old HoodieKVComparatorV2 for boostrap case. Adding the
  new comparator as HoodieKVComparatorV2 to differentiate from the old
  one.

* [HUDI-2443] Hudi KVComparator for all HFile writer usages

 - Renamed HoodieKVComparatorV2 to HoodieMetadataKVComparator and moved it
   under the package org.apache.hudi.metadata.

* Make comparator classname configurable

* Revert new config and address other review comments

Co-authored-by: Sagar Sumit <sagarsumit09@gmail.com>

hudi-common/src/test/java/org/apache/hudi/common/fs/inline/TestInLineFileSystemHFileInLining.java

@@ -19,6 +19,7 @@
 package org.apache.hudi.common.fs.inline;
 
 import org.apache.hudi.common.testutils.FileSystemTestUtils;
+import org.apache.hudi.io.storage.HoodieHBaseKVComparator;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
@@ -92,7 +93,7 @@ public class TestInLineFileSystemHFileInLining {
     HFile.Writer writer = HFile.getWriterFactory(inMemoryConf, cacheConf)
         .withOutputStream(fout)
         .withFileContext(meta)
-        .withComparator(new KeyValue.KVComparator())
+        .withComparator(new HoodieHBaseKVComparator())
         .create();
 
     writeRecords(writer);