ci(.github): add codecov.yml for failure threshold

[dj8yfo]

theoretically this should make coverage workflow not fail if single pr/change introduces less than 0.2% decrease of coverage

[dj8yfo]

referencing codecov/codecov-action#554

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.20%. Comparing base (837061f) to head (7421d2c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   80.20%   80.20%           
=======================================
  Files         104      104           
  Lines       14819    14819           
=======================================
  Hits        11886    11886           
  Misses       2933     2933           

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[dj8yfo]

@race-of-sloths include

[race-of-sloths]

@dj8yfo Thank you for your contribution! Your pull request is now a part of the Race of Sloths!

Current status: executed

Reviewer	Score
@akorchyn	3

Your contribution is much appreciated with a final score of 3!
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[akorchyn]

@race-of-sloths score 3