Enable following symbolic links when traversing a directory

[jmoraleda]

This PR adds an option to extract_from_dir and frontend to follow symbolic links when traversing a directory. This was a missing feature. The rationale for it is in the issue description and comments: https://github.com/python-babel/babel/issues/1211#issuecomment-2970753046

Fixes #1211

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.98%. Comparing base (d7a7589) to head (e1762b0). Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1212      +/-   ##
==========================================
+ Coverage   91.71%   91.98%   +0.27%     
==========================================
  Files          27       27              
  Lines        4685     4694       +9     
==========================================
+ Hits         4297     4318      +21     
+ Misses        388      376      -12     

Flag	Coverage Δ
macos-14-3.10	91.03% <100.00%> (+0.27%)	:arrow_up:
macos-14-3.11	90.96% <100.00%> (+0.27%)	:arrow_up:
macos-14-3.12	91.18% <100.00%> (+0.27%)	:arrow_up:
macos-14-3.13	91.18% <100.00%> (+0.27%)	:arrow_up:
macos-14-3.8	90.89% <100.00%> (+0.27%)	:arrow_up:
macos-14-3.9	90.96% <100.00%> (+0.27%)	:arrow_up:
macos-14-pypy3.10	91.03% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.10	91.05% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.11	90.98% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.12	91.20% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.13	91.20% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.8	90.91% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-3.9	90.98% <100.00%> (+0.27%)	:arrow_up:
ubuntu-24.04-pypy3.10	91.05% <100.00%> (+0.48%)	:arrow_up:
windows-2022-3.10	91.04% <100.00%> (+0.27%)	:arrow_up:
windows-2022-3.11	90.97% <100.00%> (+0.27%)	:arrow_up:
windows-2022-3.12	91.19% <100.00%> (+0.27%)	:arrow_up:
windows-2022-3.13	91.19% <100.00%> (+0.27%)	:arrow_up:
windows-2022-3.8	91.01% <100.00%> (+0.27%)	:arrow_up:
windows-2022-3.9	90.97% <100.00%> (+0.27%)	:arrow_up:
windows-2022-pypy3.10	91.04% <100.00%> (+0.27%)	:arrow_up:

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