Use compiled Pattern for path splitting instead of String.split in ClassFinder

[kamilkrzywanski]

Replaced String-based split with a compiled Pattern to avoid repeated pattern compilation

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.0037%. Comparing base (4e0dc1a) to head (5fac7b4).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2323        +/-   ##
==================================================
- Coverage     67.0088%   67.0037%   -0.0052%     
+ Complexity      29326      29325         -1     
==================================================
  Files            1382       1382                
  Lines          116604     116604                
  Branches        20427      20427                
==================================================
- Hits            78135      78129         -6     
- Misses          32036      32038         +2     
- Partials         6433       6437         +4     

Files with missing lines	Coverage Δ
...a/org/codehaus/groovy/vmplugin/v9/ClassFinder.java	74.0741% <100.0000%> (ø)

... and 3 files with indirect coverage changes

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[paulk-asert]

Merged, thanks!

[Copilot]

Pull request overview

This PR optimizes the ClassFinder.find() method by pre-compiling the path separator regex pattern instead of compiling it on every split() call. The optimization is particularly valuable because the pattern is reused in the visitFile() callback which may be invoked many times during file tree traversal.

Key Changes:

• Pre-compile the path separator pattern once using Pattern.compile(Pattern.quote(...))
• Replace String.split() calls with Pattern.split() to use the compiled pattern
• Apply the optimization to two split operations: one on the prefix path and one inside the file visitor callback

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