feat: setup codecov

[wagerfield]

Resolves #465

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	100% / 100%	104 / 104
🟢	Statements	100% / 100%	104 / 104
🟢	Functions	100% / 100%	2 / 2
🟢	Branches	100% / 100%	23 / 23

File Coverage

No changed files found.

Generated in workflow #11

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d6deb5a) 100.00% compared to head (046da96) 100.00%.
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #466    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           25         2    -23     
  Lines          453       104   -349     
  Branches        57        14    -43     
==========================================
- Hits           453       104   -349     

Files Changed	Coverage Δ
src/onno.ts	100.00% <ø> (ø)
src/onno.types.ts	100.00% <ø> (ø)

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