GROOVY-11656: Create SGM#getLength methods for StringBuilder/StringBu…

[paulk-asert]

…ffer

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.9908%. Comparing base (6da2f7a) to head (cec1f8a).
⚠️ Report is 760 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2216        +/-   ##
==================================================
- Coverage     68.9981%   68.9908%   -0.0073%     
  Complexity      29631      29631                
==================================================
  Files            1423       1423                
  Lines          114222     114224         +2     
  Branches        19811      19811                
==================================================
- Hits            78811      78804         -7     
- Misses          28794      28800         +6     
- Partials         6617       6620         +3     

Files with missing lines	Coverage Δ
...g/codehaus/groovy/runtime/StringGroovyMethods.java	83.2031% <100.0000%> (+0.0438%)	⬆️

... and 4 files with indirect coverage changes

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