[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>

pom.xml

@@ -107,6 +107,7 @@
     <surefire-log4j.file>file://${project.basedir}/src/test/resources/log4j-surefire.properties</surefire-log4j.file>
     <thrift.version>0.12.0</thrift.version>
     <jetty.version>9.4.15.v20190215</jetty.version>
+    <htrace.version>3.1.0-incubating</htrace.version>
     <hbase.version>1.2.3</hbase.version>
     <codehaus-jackson.version>1.9.13</codehaus-jackson.version>
     <h2.version>1.4.199</h2.version>