[HUDI-242] Support for RFC-12/Bootstrapping of external datasets to hudi (#1876)

- [HUDI-418] Bootstrap Index Implementation using HFile with unit-test
 - [HUDI-421] FileSystem View Changes to support Bootstrap with unit-tests
 - [HUDI-424] Implement Query Side Integration for querying tables containing bootstrap file slices
 - [HUDI-423] Implement upsert functionality for handling updates to these bootstrap file slices
 - [HUDI-421] Bootstrap Write Client with tests
 - [HUDI-425] Added HoodieDeltaStreamer support
 - [HUDI-899] Add a knob to change partition-path style while performing metadata bootstrap
 - [HUDI-900] Metadata Bootstrap Key Generator needs to handle complex keys correctly
 - [HUDI-424] Simplify Record reader implementation
 - [HUDI-423] Implement upsert functionality for handling updates to these bootstrap file slices
 - [HUDI-420] Hoodie Demo working with hive and sparkSQL. Also, Hoodie CLI working with bootstrap tables

Co-authored-by: Mehrotra <uditme@amazon.com>
Co-authored-by: Vinoth Chandar <vinoth@apache.org>
Co-authored-by: Balaji Varadarajan <varadarb@uber.com>

hudi-utilities/src/test/resources/delta-streamer-config/source.avsc

@@ -68,8 +68,7 @@
   },{
     "name" : "current_ts",
     "type" : {
-      "type" : "long",
-      "logicalType" : "timestamp-micros"
+      "type" : "long"
       }
   },{
     "name" : "height",

hudi-utilities/src/test/resources/delta-streamer-config/target.avsc

@@ -68,8 +68,7 @@
   },{
     "name" : "current_ts",
     "type" : {
-      "type" : "long",
-      "logicalType" : "timestamp-micros"
+      "type" : "long"
       }
   }, {
     "name" : "height",