PIP-254: Support configuring client version

[BewareMyPower]

Motivation

#19705

Modifications

• Add the ClientBuilderImpl#description method to add the description to the original client version string that is set in CommandConnect and CommandAuthResponse.
• Add testClientVersion to cover these two cases.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: BewareMyPower#21

[RobertIndie]

+1 for the new change.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.88%. Comparing base (dd05408) to head (927064b).
⚠️ Report is 2662 commits behind head on master.

Files with missing lines	Patch %	Lines
...g/apache/pulsar/client/impl/ClientBuilderImpl.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #20009       +/-   ##
=============================================
+ Coverage     34.65%   72.88%   +38.22%     
- Complexity    12429    31673    +19244     
=============================================
  Files          1606     1858      +252     
  Lines        125026   137532    +12506     
  Branches      13667    15129     +1462     
=============================================
+ Hits          43332   100240    +56908     
+ Misses        76081    29319    -46762     
- Partials       5613     7973     +2360     

Flag	Coverage Δ
inttests	24.24% <28.57%> (-0.14%)	⬇️
systests	25.00% <28.57%> (?)
unittests	72.18% <71.42%> (+39.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../java/org/apache/pulsar/client/impl/ClientCnx.java	71.48% <100.00%> (+22.49%)	⬆️
...lsar/client/impl/conf/ClientConfigurationData.java	96.63% <100.00%> (+8.50%)	⬆️
...g/apache/pulsar/client/impl/ClientBuilderImpl.java	84.76% <50.00%> (+35.78%)	⬆️

... and 1502 files with indirect coverage changes

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