Refactor reopen log signal

[matyhtf]

No longer using the SIGRTMIN signal; instead, the logs will be reopened upon receiving SIGWINCH. SIGRTMIN is a feature unique to Linux.

[codecov]

Codecov Report

Attention: Patch coverage is 73.17073% with 11 lines in your changes missing coverage. Please review.

Project coverage is 82.97%. Comparing base (f51efd0) to head (36d7a30).

Files with missing lines	Patch %	Lines
src/os/process_pool.cc	0.00%	5 Missing ⚠️
src/server/master.cc	50.00%	3 Missing ⚠️
src/server/worker.cc	81.81%	2 Missing ⚠️
src/server/manager.cc	94.11%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5778   +/-   ##
=======================================
  Coverage   82.97%   82.97%           
=======================================
  Files         107      107           
  Lines       17261    17273   +12     
  Branches     3063     3064    +1     
=======================================
+ Hits        14323    14333   +10     
- Misses       2938     2940    +2     

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