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 65.38%. Comparing base (f145469) to head (fe3e4d0).

Files	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   65.59%   65.38%   -0.21%     
==========================================
  Files          34       34              
  Lines        3941     3955      +14     
  Branches      901      904       +3     
==========================================
+ Hits         2585     2586       +1     
- Misses       1001     1011      +10     
- Partials      355      358       +3     

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