Regex Improvements

[jasonwilliams]

• inline the take_while_ascii_pred function
• change flag handling to stack allocation by using a fixed sized array
• Parse regex literals at an earlier opportunity when inspecting expressions (to reduce stack depth)

[codecov]

Codecov Report

Attention: Patch coverage is 62.16216% with 14 lines in your changes missing coverage. Please review.

Project coverage is 50.31%. Comparing base (6ddc2b4) to head (1cb09f4).
Report is 460 commits behind head on main.

Files with missing lines	Patch %	Lines
core/parser/src/lexer/regex.rs	71.42%	8 Missing ⚠️
core/parser/src/lexer/cursor.rs	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4310      +/-   ##
==========================================
+ Coverage   47.24%   50.31%   +3.07%     
==========================================
  Files         476      498      +22     
  Lines       46892    49924    +3032     
==========================================
+ Hits        22154    25120    +2966     
- Misses      24738    24804      +66     

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[AdithyaLaakso]

I took your suggestion in the issues and made a new function for this issue using an arrayvec which I believe will be marginally more memory efficient in the vast majority of cases (where no flags are given) than allocating an array. Additionally, I added error handling for the case where more than 8 regex flags are added and preserved the original version of the function for future use.

However, your pull request covers a lot of area that mine does not we should merge them!