[fix][admin] Refactor bookie affinity group sync operations to async in rest api

[oneby-wang]

Motivation

It is not recommended to use sync operations in NIO threads, which would block other operations and degrade the overall performance of the system.

Modifications

Refactor bookie affinity group sync operations to async in rest api, and add tests.

Verifying this change

• [x] Make sure that the change passes the CI checks.

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
• [x] The REST endpoints
• [ ] The admin CLI options
• [ ] The metrics
• [ ] Anything that affects deployment

Documentation

• [ ] doc
• [ ] doc-required
• [x] doc-not-needed
• [ ] doc-complete

Matching PR in forked repository

PR in forked repository: https://github.com/oneby-wang/pulsar/pull/12

[codecov-commenter]

Codecov Report

:x: Patch coverage is 89.65517% with 6 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 74.32%. Comparing base (5356b64) to head (1da9c88). :warning: Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
.../org/apache/pulsar/broker/admin/v1/Namespaces.java	66.66%	6 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #25050       +/-   ##
=============================================
+ Coverage     38.52%   74.32%   +35.79%     
- Complexity    13307    34127    +20820     
=============================================
  Files          1864     1921       +57     
  Lines        146217   150416     +4199     
  Branches      16985    17470      +485     
=============================================
+ Hits          56335   111797    +55462     
+ Misses        82212    29686    -52526     
- Partials       7670     8933     +1263     

Flag	Coverage Δ
inttests	26.36% <0.00%> (+0.19%)	:arrow_up:
systests	22.86% <0.00%> (+0.03%)	:arrow_up:
unittests	73.87% <89.65%> (+39.04%)	:arrow_up:

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

Files with missing lines	Coverage Δ
...ulsar/broker/resources/LocalPoliciesResources.java	76.66% <100.00%> (+18.04%)	:arrow_up:
...pache/pulsar/broker/admin/impl/NamespacesBase.java	75.90% <100.00%> (+44.09%)	:arrow_up:
.../org/apache/pulsar/broker/admin/v2/Namespaces.java	91.01% <100.00%> (+70.62%)	:arrow_up:
.../org/apache/pulsar/broker/admin/v1/Namespaces.java	53.01% <66.66%> (+47.15%)	:arrow_up:

... and 1419 files with indirect coverage changes

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