ENH: Add PDB reader benchmark to track parsing performance

[Dreamstick9]

Changes made in this Pull Request:

• Contributes to performance benchmarks #1023
• Added PDBReaderBench class to benchmarks/benchmarks/traj_reader.py.
• it benchmarks PDB format reading and parsing across different number of frames ([10, 100, 500]) using the standard PDB test file.

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: no

PR Checklist

• Issue raised/referenced?
• Tests updated/added?
• Documentation updated/added?
• package/CHANGELOG file updated?
• Is your name in package/AUTHORS? (If it is not, add it!)
• LLM/AI disclosure was updated.

Developers Certificate of Origin

I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.

[read-the-docs-community]

Documentation build overview

📚 MDAnalysis | 🛠️ Build #32994886 | 📁 Comparing 625961e against latest (941d679)

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2 files changed

± index.html
± documentation_pages/analysis/wbridge_analysis.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.85%. Comparing base (b05a84b) to head (625961e).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5394   +/-   ##
========================================
  Coverage    93.85%   93.85%           
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  Files          182      182           
  Lines        22509    22509           
  Branches      3202     3202           
========================================
  Hits         21125    21125           
  Misses         922      922           
  Partials       462      462           

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