Refactor import statements in _formats.py

[jrycw]

This PR focuses on cleaning up the import statements in _formats.py:

• Moved import re and from dataclasses import dataclass to the top, as they were previously placed near the end of the file.
• Removed the redundant local import of import re, now handled at the top level.
• Eliminated the local import of from pathlib import Path within a function, as Path is already imported at the top level and is required for type hints in other functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.73%. Comparing base (ea03bbc) to head (e91bbaa).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
- Coverage   86.75%   86.73%   -0.02%     
==========================================
  Files          42       42              
  Lines        4702     4698       -4     
==========================================
- Hits         4079     4075       -4     
  Misses        623      623              

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[machow]

LGTM! thanks for tidying this up

[rich-iannone]

Thanks!