feat: optimize the parsing code for speed

[APN-Pucky]

No description provided.

[github-actions]

🏎️ Benchmark Comparison

------------------------------------------------------------------------------------------ benchmark: 2 tests -----------------------------------------------------------------------------------------
Name (time in s)                                Min               Max              Mean            StdDev            Median               IQR            Outliers     OPS            Rounds  Iterations
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_fromfile_and_to_awkward (0001_base)     3.8559 (1.0)      3.8981 (1.0)      3.8702 (1.0)      0.0118 (1.0)      3.8686 (1.0)      0.0044 (1.0)           3;3  0.2584 (1.0)          10           1
test_fromfile_and_to_awkward (0002_mr)       3.8860 (1.01)     3.9196 (1.01)     3.8990 (1.01)     0.0126 (1.07)     3.8944 (1.01)     0.0229 (5.15)          3;0  0.2565 (0.99)         10           1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean

[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.18%. Comparing base (cdc987b) to head (753e01b).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pylhe/__init__.py	97.22%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #330      +/-   ##
==========================================
- Coverage   97.43%   97.18%   -0.25%     
==========================================
  Files           2        2              
  Lines         506      462      -44     
  Branches       57       56       -1     
==========================================
- Hits          493      449      -44     
  Misses          8        8              
  Partials        5        5              

Flag	Coverage Δ
unittests-3.10	?
unittests-3.11	?
unittests-3.12	?
unittests-3.13	?
unittests-3.9	97.18% <97.22%> (+0.02%)	⬆️

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[Copilot]

Pull Request Overview

This PR simplifies integer parsing and improves memory management in the LHE file parser. The changes remove unnecessary float conversion when parsing integer values and optimize XML element memory cleanup.

• Simplified integer parsing by removing redundant int(float(...)) conversions
• Improved memory management with periodic root element clearing and cleanup in finally block
• Refactored string processing to pre-strip particle strings for consistency

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[APN-Pucky]

No speed up, cf. #300 (comment)