use Base.hash_bytes on latest julia

[stevengj]

Closes #29, cc @adienes

[adienes]

seems right to me, although I suppose there are some in-progress plans to simplify the migration path that may be even simpler?

[stevengj]

I want to have exactly the same hash as String if possible, so I copied the new hash(::String) implementation.

If we get a generic version that gives the same hash and is almost as fast, I can always delete this method. (But the sad fact is that StringViews.jl requires a lot of access to Julia internals, e.g. for regex searching.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.58%. Comparing base (7c7f0b6) to head (be1826d).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #30      +/-   ##
==========================================
+ Coverage   75.05%   77.58%   +2.52%     
==========================================
  Files           6        6              
  Lines         417      473      +56     
==========================================
+ Hits          313      367      +54     
- Misses        104      106       +2     

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