GROOVY-11957: Add DGM#grepping(Iterator)

[paulk-asert]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.0826%. Comparing base (ef61daf) to head (00bf2a2).
⚠️ Report is 121 commits behind head on master.

Files with missing lines	Patch %	Lines
.../codehaus/groovy/runtime/DefaultGroovyMethods.java	81.8182%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2486        +/-   ##
==================================================
- Coverage     67.1014%   67.0826%   -0.0187%     
- Complexity      30870      31581       +711     
==================================================
  Files            1435       1451        +16     
  Lines          119619     122525      +2906     
  Branches        21182      21994       +812     
==================================================
+ Hits            80266      82193      +1927     
- Misses          32664      33244       +580     
- Partials         6689       7088       +399     

Files with missing lines	Coverage Δ
.../codehaus/groovy/runtime/DefaultGroovyMethods.java	74.7481% <81.8182%> (+0.0451%)	⬆️

... and 109 files with indirect coverage changes

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