file_iterator: implement a _copy() function

[Gottox]

This function creates a copy of the iterator that has the same state as the original iterator.

[codecov]

Codecov Report

Attention: Patch coverage is 53.19149% with 66 lines in your changes missing coverage. Please review.

Project coverage is 64.10%. Comparing base (13c79fd) to head (43ecf72).
Report is 3 commits behind head on main.

Files	Patch %	Lines
libsqsh/src/file/fragment_view.c	20.68%	21 Missing and 2 partials ⚠️
common/src/reader/reader.c	63.63%	6 Missing and 6 partials ⚠️
libsqsh/src/file/file_iterator.c	63.63%	4 Missing and 4 partials ⚠️
libsqsh/src/mapper/map_manager.c	20.00%	7 Missing and 1 partial ⚠️
libsqsh/src/mapper/map_reader.c	53.84%	3 Missing and 3 partials ⚠️
libsqsh/src/mapper/map_iterator.c	68.75%	3 Missing and 2 partials ⚠️
libsqsh/src/extract/extract_view.c	73.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
- Coverage   64.37%   64.10%   -0.27%     
==========================================
  Files          75       75              
  Lines        5752     5893     +141     
  Branches      874      903      +29     
==========================================
+ Hits         3703     3778      +75     
- Misses       1531     1577      +46     
- Partials      518      538      +20     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud