feat(loader): support load config failure option

[ysknsid25]

trafficstars

resolves https://github.com/unjs/c12/issues/234

[pi0]

Thanks for preparing PR.

I might need time to locally test everything before merge and release of it but current implementation looks good 👍🏼

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 78.12%. Comparing base (42d9697) to head (6e71e65). :warning: Report is 149 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
+ Coverage   76.92%   78.12%   +1.20%     
==========================================
  Files           7        6       -1     
  Lines         806      631     -175     
  Branches       80      126      +46     
==========================================
- Hits          620      493     -127     
+ Misses        184      138      -46     
+ Partials        2        0       -2     

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[ysknsid25]

@pi0 Thanks for the review!! 😊