Enhance cluster config update API to handle non-string values properly

[Jackie-Jiang]

• Process non-string value from json input properly when updating the cluster config
• Reduce ZK access when multiple configs are updated
• Manually tested

[codecov-commenter]

Codecov Report

Merging #9635 (839e096) into master (273e1de) will decrease coverage by 4.61%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master    #9635      +/-   ##
============================================
- Coverage     68.43%   63.81%   -4.62%     
+ Complexity     4929     4907      -22     
============================================
  Files          1947     1894      -53     
  Lines        104165   101786    -2379     
  Branches      15794    15518     -276     
============================================
- Hits          71283    64953    -6330     
- Misses        27824    32076    +4252     
+ Partials       5058     4757     -301     

Flag	Coverage Δ
integration2	?
unittests1	67.37% <ø> (+0.03%)	⬆️
unittests2	15.66% <75.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
.../controller/api/resources/PinotClusterConfigs.java	36.58% <75.00%> (+2.37%)	⬆️
...va/org/apache/pinot/core/routing/RoutingTable.java	0.00% <0.00%> (-100.00%)	⬇️
...va/org/apache/pinot/common/config/NettyConfig.java	0.00% <0.00%> (-100.00%)	⬇️
...a/org/apache/pinot/common/metrics/MinionMeter.java	0.00% <0.00%> (-100.00%)	⬇️
...g/apache/pinot/common/metrics/ControllerMeter.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/BrokerQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/MinionQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
...ache/pinot/server/access/AccessControlFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...he/pinot/common/messages/SegmentReloadMessage.java	0.00% <0.00%> (-100.00%)	⬇️
...he/pinot/common/messages/TableDeletionMessage.java	0.00% <0.00%> (-100.00%)	⬇️
... and 381 more

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