Add Table::stats()

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #4405 (e6b0e18) into master (8cfc100) will increase coverage by 2.39%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master    #4405      +/-   ##
==========================================
+ Coverage   51.42%   53.82%   +2.39%     
==========================================
  Files          73       73              
  Lines       14692    15767    +1075     
==========================================
+ Hits         7556     8487     +931     
- Misses       7136     7280     +144     

Impacted Files	Coverage Δ
src/memory/fixed_pool.cc	76.36% <0.00%> (-4.41%)	⬇️
src/memory/table.cc	54.54% <33.33%> (-1.83%)	⬇️
src/wrapper/event.cc	88.88% <0.00%> (-1.50%)	⬇️
src/reactor/base.cc	81.05% <0.00%> (+0.32%)	⬆️
src/network/socket.cc	48.74% <0.00%> (+0.52%)	⬆️
src/server/message_bus.cc	80.13% <0.00%> (+0.68%)	⬆️
src/server/reactor_thread.cc	59.71% <0.00%> (+1.94%)	⬆️
src/protocol/base.cc	65.13% <0.00%> (+1.97%)	⬆️
src/server/worker.cc	60.75% <0.00%> (+7.27%)	⬆️
src/server/manager.cc	40.35% <0.00%> (+9.47%)	⬆️
... and 4 more

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