ServicePool v2

[TheXDS]

This PR includes all changes made to rewrite ServicePool into version 2.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (e2cf681) 96.25% compared to head (97f900c) 97.31%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...c/ServicePool/Resources/Strings/Errors.Designer.cs	71.42%	4 Missing ⚠️
src/ServicePool/Pool.cs	98.50%	0 Missing and 1 partial ⚠️
src/ServicePool/PoolBase.cs	97.61%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   96.25%   97.31%   +1.06%     
==========================================
  Files           7       11       +4     
  Lines         187      261      +74     
  Branches       28       37       +9     
==========================================
+ Hits          180      254      +74     
  Misses          5        5              
  Partials        2        2              

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