[improve][broker] Part-3 of PIP-434: add configurations to broker.conf

[poorbarcode]

Motivation

See the PIP-434

• [improve][pip] PIP-434: Expose Netty channel configuration WRITE_BUFFER_WATER_MARK to pulsar conf and pause receive requests when channel is unwritable #24510

Modifications

• add configurations to broker.conf
• Correct ratelimiter interval

Documentation

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

Matching PR in forked repository

PR in forked repository: x

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.15%. Comparing base (1050f48) to head (43a84ed).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #24800       +/-   ##
=============================================
+ Coverage     38.67%   74.15%   +35.48%     
- Complexity    13237    33363    +20126     
=============================================
  Files          1850     1911       +61     
  Lines        144540   149033     +4493     
  Branches      16763    17294      +531     
=============================================
+ Hits          55895   110522    +54627     
+ Misses        81156    29667    -51489     
- Partials       7489     8844     +1355     

Flag	Coverage Δ
inttests	26.37% <0.00%> (-0.32%)	⬇️
systests	22.68% <0.00%> (-0.13%)	⬇️
unittests	73.69% <100.00%> (+38.82%)	⬆️

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

Files with missing lines	Coverage Δ
...org/apache/pulsar/broker/ServiceConfiguration.java	98.20% <ø> (+3.09%)	⬆️
...va/org/apache/pulsar/broker/service/ServerCnx.java	72.43% <100.00%> (+27.42%)	⬆️

... and 1410 files with indirect coverage changes

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