Change private WithArgument methods to public

[pcf0]

FFMpegArgumentOptions.WithArgument is already public, which allows extensions.
However, this is not nice semantically, as the global arguments (e.g. -hide_banner, -nostats) have to be given as input arguments.

So I changed the other two methods of the classes FFMpegGlobalArguments and VideoFilterOptions from private to public to allow an extension here as well.
I have changed the name of the method FFMpegGlobalArguments.WithOption() to FFMpegGlobalArguments.WithArgument() so that it is consistent.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.72%. Comparing base (1c4333e) to head (9f779a5).
⚠️ Report is 195 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #603      +/-   ##
==========================================
+ Coverage   71.20%   71.72%   +0.51%     
==========================================
  Files         117      123       +6     
  Lines        2973     3544     +571     
  Branches      284      311      +27     
==========================================
+ Hits         2117     2542     +425     
- Misses        751      888     +137     
- Partials      105      114       +9     

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