[improve][broker] Allow to use io_uring instead of epoll

[coderzc]

Motivation & Modifications

Allow users to enable IO_uring for BK network transport for broker/proxy/client, similar to apache/bookkeeper#3595

Documentation

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

Matching PR in forked repository

PR in forked repository: coderzc#28

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.14%. Comparing base (27186a1) to head (775357f).
⚠️ Report is 3362 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #18385      +/-   ##
============================================
- Coverage     45.61%   45.14%   -0.48%     
+ Complexity    10728    10604     -124     
============================================
  Files           752      752              
  Lines         72521    72523       +2     
  Branches       7791     7791              
============================================
- Hits          33083    32738     -345     
- Misses        35769    36147     +378     
+ Partials       3669     3638      -31     

Flag	Coverage Δ
unittests	45.14% <ø> (-0.48%)	⬇️

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[tisonkun]

I'm wondering whether we need a prefix here, or if it's the same as how netty does it.

That said, if it's a Pulsar specific property, name it as:

private static final String ENABLE_IO_URING_KEY = "pulsar.enableUring";

can avoid accidental conflicts.

[nodece]

Sorry for missing this comment. This is a good idea, so like: pulsar.enable.io_uring.

[tisonkun]

I learn more properties don't separate enable and the target with a .. But it can be a style preference :)

[coderzc]

Good suggestion, I will push a new PR to improve it.

[coderzc]

@nodece Please also help to add labels and milestone.

[momo-jun]

@coderzc Since 2.11 has been released, now it's good timing to start adding the docs for this feature to the next version of docs. Feel free to share your plans and anything I can help with. Thank you.