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 (5356536) to head (9f779a5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #603   +/-   ##
=======================================
  Coverage   71.72%   71.72%           
=======================================
  Files         123      123           
  Lines        3544     3544           
  Branches      311      311           
=======================================
  Hits         2542     2542           
  Misses        888      888           
  Partials      114      114           

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