Add Path::file()

[Baptouuuu]

By default paths are treated as url paths meaning it cannot contains characters as ? or # as they represent queries and fragments.

But this is problematic when using this package to represent file paths, such as in innmind/filesystem, where a file name should be able to contain these characters.

To allow this while not breaking compatibility this adds a new ::file() constructor to differentiate them.

[codecov]

Codecov Report

❌ Patch coverage is 91.83673% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.51%. Comparing base (0274685) to head (21c8d99).

Files with missing lines	Patch %	Lines
src/Path.php	85.18%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #27      +/-   ##
=============================================
- Coverage      98.59%   98.51%   -0.08%     
- Complexity       522      536      +14     
=============================================
  Files             33       33              
  Lines           1779     1818      +39     
=============================================
+ Hits            1754     1791      +37     
- Misses            25       27       +2     

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