Enhance path type detection for posix and windows paths in fieldtypes

[yunzheng]

fixes #199

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.26%. Comparing base (f3a1c5f) to head (d907074).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
- Coverage   83.27%   83.26%   -0.02%     
==========================================
  Files          35       35              
  Lines        3696     3705       +9     
==========================================
+ Hits         3078     3085       +7     
- Misses        618      620       +2     

Flag	Coverage Δ
unittests	83.26% <100.00%> (-0.02%)	⬇️

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[Copilot]

Pull request overview

This PR enhances path type detection in the fieldtypes module by adding string path support to the _is_posixlike_path() and _is_windowslike_path() helper functions. Previously, these functions only handled pathlib.PurePath objects; now they can also detect path types from raw string paths, enabling the path class to correctly determine whether a string argument represents a POSIX or Windows path.

• Added string detection logic to _is_posixlike_path() (checks for "/" without "\")
• Added string detection logic to _is_windowslike_path() (checks for Windows drive pattern or "\")
• Updated tests to reflect new behavior where strings are now properly type-detected

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
flow/record/fieldtypes/init.py	Added string path type detection to _is_posixlike_path() and _is_windowslike_path() helper functions
tests/fieldtypes/test_fieldtypes.py	Updated test expectations to reflect that string "/foo/bar" is now correctly detected as POSIX-like, and adjusted test_path_multiple_parts to expect posix_path when the first argument is a POSIX-like string

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