Introduce createFormatter Static Method for Formatter Logic

[salehhashemi1992]

Introduce a new static method, createFormatter, which encapsulates the existing logic for creating a formatter based on locale, type, and pattern.

It helps adhere to the DRY principle.

Also add two missing @thows lines in PHPDoc comments.

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (5d8a96e) 48.96% compared to head (a1dba1d) 22.25%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #20014       +/-   ##
===========================================
- Coverage   48.96%   22.25%   -26.71%     
===========================================
  Files         445      445               
  Lines       42839    42031      -808     
===========================================
- Hits        20978     9356    -11622     
- Misses      21861    32675    +10814     

Files	Coverage Δ
framework/helpers/BaseFormatConverter.php	0.00% <0.00%> (-11.49%)	⬇️

... and 240 files with indirect coverage changes

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[bizley]

Let's make it private so there will be not reason to test again for intl extension insie and there is no need to have this method public.

[salehhashemi1992]

@bizley Done

[samdark]

Thanks.