Replace base_state counter with a custom picklable one

[robosa]

FIxes #128

[robosa]

Bump :) It would be nice to have this merge for python 3.14 compatibility!

[Copilot]

Pull request overview

This pull request replaces itertools.count() with a custom _PicklableCounter class to enable pickling of JSF instances, addressing issue #128.

Changes:

• Removed itertools.count import and replaced it with a custom _PicklableCounter class
• The new counter class maintains the same behavior as count(start=1), returning sequential integers starting from 1

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[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.22%. Comparing base (cc802a4) to head (c886525).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
jsf/parser.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   99.37%   99.22%   -0.15%     
==========================================
  Files          31       31              
  Lines        1272     1287      +15     
==========================================
+ Hits         1264     1277      +13     
- Misses          8       10       +2     

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