xargs: Implement replace / -I (Closes: #310)

[sylvestre]

Closes: #310

[codecov]

Codecov Report

Attention: Patch coverage is 78.07018% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 58.36%. Comparing base (274d749) to head (45c1938).

Files	Patch %	Lines
tests/xargs_tests.rs	72.22%	0 Missing and 20 partials ⚠️
src/xargs/mod.rs	88.09%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
+ Coverage   58.12%   58.36%   +0.23%     
==========================================
  Files          30       30              
  Lines        3630     3713      +83     
  Branches      821      841      +20     
==========================================
+ Hits         2110     2167      +57     
- Misses       1220     1223       +3     
- Partials      300      323      +23     

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[sylvestre]

i think we are good this time :)

[cakebaker]

Good work :)

[sylvestre]

many thanks for this terrific review :)