codelipenghui opened a new pull request #5928: [java-client] Add support for 
key hash range reading.
URL: https://github.com/apache/pulsar/pull/5928
 
 
   Master Issue: #4077
   
   ### Motivation
   
   Add support for sticky key hash range reader. Broker will only dispatch 
messages which hash of the message key contains by  the specified key hash 
range. 
   
   Multiple key hash ranges can be specified on a reader by following example:
   ```java
   pulsarClient.newReader()
                       .topic(topic)
                       .startMessageId(MessageId.earliest)
                       .keyHashRange(Range.of(0, 10000), Range.of(20001, 30000))
                       .create();
   ```
   
   ### Verifying this change
   
   New unit tests was added for cover this change
   
   ### Does this pull request potentially affect one of the following parts:
   
   *If `yes` was chosen, please highlight the changes*
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API: (yes )
     - The schema: (no)
     - The default values of configurations: (no)
     - The wire protocol: (no)
     - The rest endpoints: (no)
     - The admin cli options: (no)
     - Anything that affects deployment: (no)
   
   ### Documentation
   
     - Does this pull request introduce a new feature? (yes)
   

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