simple_hash faster by lifting length(str)

[adienes]

avoids github.com/JuliaLang/julia/issues/33712, matches JuliaLang/Tokenize.jl#213

probably rarely makes a difference but might as well; this should be strictly better.

[simeonschaub]

I don't think using length here is even correct for non-ASCII strings, this code should be using lastindex instead

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.25%. Comparing base (30109d4) to head (542dcd7).
Report is 26 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #553      +/-   ##
==========================================
+ Coverage   96.18%   96.25%   +0.07%     
==========================================
  Files          13       13              
  Lines        4032     4331     +299     
==========================================
+ Hits         3878     4169     +291     
- Misses        154      162       +8     

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