Populate the default thread pool configuration to the thread pool instance (add attribute)

[f-zm]

Populate the default thread pool configuration to the thread pool instance (add attribute)
Fixes #1068

Changes proposed in this pull request:

Check mailbox configuration when submitting. Contributor Guide

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (68a635b) 28.52% compared to head (dd52cc3) 28.52%.

❗ Current head dd52cc3 differs from pull request most recent head 9ab6271. Consider uploading reports for the commit 9ab6271 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1081   +/-   ##
==========================================
  Coverage      28.52%   28.52%           
  Complexity       708      708           
==========================================
  Files            243      243           
  Lines           5721     5721           
  Branches         523      523           
==========================================
  Hits            1632     1632           
  Misses          3942     3942           
  Partials         147      147           

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