GROOVY-12147: Add locale-aware number, currency and percent formattin…

[paulk-asert]

…g/parsing to the GDK (back out some variants and clarify javadoc)

[testlens-app]

✅ All tests passed ✅

⚠️ TestLens detected flakiness ⚠️

Test Summary

Build and test / lts (17, windows-latest, 1) > :test

Test	Runs	Flakiness
BroadcastChannelAsPublisherTest > forAwaitOverPublisher()	❌ ✅	0% 🟢

🏷️ Commit: c4e866e
▶️ Tests: 20767 executed
⚪️ Checks: 31/31 completed

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.1122%. Comparing base (86c6648) to head (c4e866e).

Files with missing lines	Patch %	Lines
...g/codehaus/groovy/runtime/StringGroovyMethods.java	33.3333%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2699        +/-   ##
==================================================
+ Coverage     69.1077%   69.1122%   +0.0045%     
  Complexity      34235      34235                
==================================================
  Files            1537       1537                
  Lines          129356     129352         -4     
  Branches        23503      23502         -1     
==================================================
+ Hits            89395      89398         +3     
+ Misses          31941      31934         -7     
  Partials         8020       8020                

Files with missing lines	Coverage Δ
.../codehaus/groovy/runtime/DefaultGroovyMethods.java	74.9667% <ø> (ø)
...g/codehaus/groovy/runtime/StringGroovyMethods.java	82.4108% <33.3333%> (+0.1587%)	⬆️

... and 6 files with indirect coverage changes

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