[fix][client] Fix exception when calling loadConf on a ConsumerBuilder that has a KeySharedPolicy

[cbornet]

Motivation

The exception occurs because KeySharedPolicy can't be deserialized.

This change also adds unit tests for loadConf

Modifications

Add JsonIgnore on ConsumerBuilder's keySharedPolicy field.

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

• Run ConsumerBuilderImplTest::testLoadConf and ConsumerBuilderImplTest::testLoadConfNotModified

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
• Anything that affects deployment

Documentation

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

Matching PR in forked repository

PR in forked repository: cbornet#6

[codecov-commenter]

Codecov Report

Merging #18345 (376f413) into master (67d9d63) will increase coverage by 6.95%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #18345      +/-   ##
============================================
+ Coverage     40.29%   47.25%   +6.95%     
- Complexity     8685    10370    +1685     
============================================
  Files           687      687              
  Lines         67441    67437       -4     
  Branches       7225     7226       +1     
============================================
+ Hits          27175    31865    +4690     
+ Misses        37257    31996    -5261     
- Partials       3009     3576     +567     

Flag	Coverage Δ
unittests	47.25% <0.00%> (+6.95%)	⬆️

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

Impacted Files	Coverage Δ
...che/bookkeeper/mledger/impl/ManagedCursorImpl.java	36.81% <0.00%> (-0.09%)	⬇️
...rg/apache/bookkeeper/mledger/impl/OpReadEntry.java	65.55% <ø> (+0.72%)	⬆️
...ar/client/impl/conf/ConsumerConfigurationData.java	92.55% <ø> (+92.55%)	⬆️
...java/org/apache/pulsar/proxy/stats/TopicStats.java	58.82% <0.00%> (-41.18%)	⬇️
.../pulsar/broker/service/SharedConsumerAssignor.java	51.85% <0.00%> (-25.93%)	⬇️
.../apache/pulsar/broker/loadbalance/LoadManager.java	61.11% <0.00%> (-16.67%)	⬇️
...tent/NonPersistentDispatcherMultipleConsumers.java	40.74% <0.00%> (-12.35%)	⬇️
...apache/pulsar/broker/service/TopicListService.java	42.62% <0.00%> (-12.30%)	⬇️
...oker/service/schema/SchemaRegistryServiceImpl.java	57.95% <0.00%> (-6.91%)	⬇️
...pulsar/broker/service/PulsarCommandSenderImpl.java	71.72% <0.00%> (-6.29%)	⬇️
... and 200 more

[eolivelli]

Lgtm