find: Implement -ok[dir] predicate.

[hanbings]

implement: #8

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 66.32%. Comparing base (e3f4224) to head (18b88ff).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/find/matchers/exec.rs	0.00%	9 Missing and 1 partial ⚠️
src/find/matchers/mod.rs	33.33%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
- Coverage   66.51%   66.32%   -0.19%     
==========================================
  Files          36       36              
  Lines        4366     4380      +14     
  Branches      982      984       +2     
==========================================
+ Hits         2904     2905       +1     
- Misses       1062     1072      +10     
- Partials      400      403       +3     

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[sylvestre]

@hanbings do you have an update on this ? thanks :)

[tavianator]

POSIX specifies

• The -ok primary shall write a prompt to standard error
• In the POSIX locale, the last non-<blank> in the prompt shall be '?'

[hanbings]

Thanks! I overlooked these, I will fix them later.