[improve][ws] Support subscribing multi/pattern topic for Websocket

[Technoboy-]

PIP-306

Motivation

Support subscribing multi/pattern topic for WS.
The new sub-path could be :

/ws/v3/consumer/subscription?topicsPattern="a.*" /ws/v3/consumer/subscription?topics="a,b,c"

Documentation

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

[mattisonchao]

Overal LGTM.

[mattisonchao]

Please help fix the checkstyle issue.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 58.82353% with 28 lines in your changes missing coverage. Please review.

Project coverage is 73.25%. Comparing base (bd86e4e) to head (6caf1ec).
Report is 1412 commits behind head on master.

Files with missing lines	Patch %	Lines
...he/pulsar/websocket/MultiTopicConsumerHandler.java	38.63%	22 Missing and 5 partials ⚠️
.../websocket/WebSocketMultiTopicConsumerServlet.java	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #21379      +/-   ##
============================================
- Coverage     73.29%   73.25%   -0.05%     
- Complexity    32505    32609     +104     
============================================
  Files          1890     1892       +2     
  Lines        140381   140444      +63     
  Branches      15425    15436      +11     
============================================
- Hits         102898   102878      -20     
- Misses        29405    29475      +70     
- Partials       8078     8091      +13     

Flag	Coverage Δ
inttests	24.14% <23.52%> (+0.04%)	⬆️
systests	24.72% <13.23%> (-0.22%)	⬇️
unittests	72.54% <55.88%> (-0.03%)	⬇️

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

Files with missing lines	Coverage Δ
...n/java/org/apache/pulsar/broker/PulsarService.java	83.07% <100.00%> (+0.14%)	⬆️
...pache/pulsar/proxy/server/ProxyServiceStarter.java	66.44% <100.00%> (+0.44%)	⬆️
...che/pulsar/websocket/AbstractWebSocketHandler.java	57.55% <100.00%> (+0.30%)	⬆️
...a/org/apache/pulsar/websocket/ConsumerHandler.java	63.09% <100.00%> (+0.59%)	⬆️
...sar/websocket/service/WebSocketServiceStarter.java	74.46% <100.00%> (+0.55%)	⬆️
.../websocket/WebSocketMultiTopicConsumerServlet.java	88.88% <88.88%> (ø)
...he/pulsar/websocket/MultiTopicConsumerHandler.java	38.63% <38.63%> (ø)

... and 79 files with indirect coverage changes

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