util: add hex colors support in styleText

[araujogui]

Fixes #61543

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.77%. Comparing base (8fd5f6b) to head (5137f07).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61556      +/-   ##
==========================================
- Coverage   89.79%   89.77%   -0.02%     
==========================================
  Files         672      673       +1     
  Lines      203756   203884     +128     
  Branches    39169    39186      +17     
==========================================
+ Hits       182956   183036      +80     
- Misses      13135    13190      +55     
+ Partials     7665     7658       -7     

Files with missing lines	Coverage Δ
lib/util.js	98.19% <100.00%> (+0.21%)	⬆️

... and 53 files with indirect coverage changes

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[ljharb]

Please add test cases for invalid values.