[pulsar] Added getTopics() implementation for Pulsar

[suvodeep-pyne]

Adds serviceHttpUrl config and topic listing capability to Pulsar stream ingestion

Key Changes

• Added new serviceHttpUrl configuration parameter for PulsarConfig that is only used by pulsar admin client. This config is only used when creating the admin client. This maintains backward compatibility.
• Implemented getTopics() method in PulsarStreamMetadataProvider to list all topics across tenants and namespaces
• Created PulsarAdmin client functionality to enable topic listing operations

Refactoring

• Extracted authentication configuration logic into separate methods
• Improved error handling in client creation and cleanup
• Enhanced code organization in PulsarPartitionLevelConnectionHandler

Testing

• Added new test case testGetTopics() to verify topic listing functionality
• Updated existing tests to include serviceHttpUrl configuration
• Verified topic listing across multiple tenants and namespaces

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.25000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 63.75%. Comparing base (59551e4) to head (06c77ca).
Report is 1602 commits behind head on master.

Files with missing lines	Patch %	Lines
.../pulsar/PulsarPartitionLevelConnectionHandler.java	75.86%	4 Missing and 3 partials ⚠️
...in/stream/pulsar/PulsarStreamMetadataProvider.java	88.23%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #14857      +/-   ##
============================================
+ Coverage     61.75%   63.75%   +2.00%     
- Complexity      207     1620    +1413     
============================================
  Files          2436     2708     +272     
  Lines        133233   151346   +18113     
  Branches      20636    23360    +2724     
============================================
+ Hits          82274    96487   +14213     
- Misses        44911    47615    +2704     
- Partials       6048     7244    +1196     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (+99.99%)	⬆️
integration	100.00% <ø> (+99.99%)	⬆️
integration1	100.00% <ø> (+99.99%)	⬆️
integration2	0.00% <ø> (ø)
java-11	63.69% <81.25%> (+1.98%)	⬆️
java-21	63.64% <81.25%> (+2.01%)	⬆️
skip-bytebuffers-false	63.74% <81.25%> (+1.99%)	⬆️
skip-bytebuffers-true	63.59% <81.25%> (+35.86%)	⬆️
temurin	63.75% <81.25%> (+2.00%)	⬆️
unittests	63.74% <81.25%> (+2.00%)	⬆️
unittests1	56.30% <ø> (+9.41%)	⬆️
unittests2	34.06% <81.25%> (+6.32%)	⬆️

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