Added Co::getStackUsage()

[matyhtf]

No description provided.

[codecov]

Codecov Report

Merging #4398 (74fbef1) into master (1739c71) will increase coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 74fbef1 differs from pull request most recent head 1aa7597. Consider uploading reports for the commit 1aa7597 to get more accurate results

@@            Coverage Diff             @@
##           master    #4398      +/-   ##
==========================================
+ Coverage   51.36%   51.41%   +0.05%     
==========================================
  Files          73       73              
  Lines       14691    14691              
==========================================
+ Hits         7546     7554       +8     
+ Misses       7145     7137       -8     

Impacted Files	Coverage Δ
src/protocol/base.cc	63.15% <0.00%> (ø)
src/os/process_pool.cc	57.89% <0.00%> (+0.45%)	⬆️
src/os/async_thread.cc	69.29% <0.00%> (+2.63%)	⬆️

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