feat: `hashAsync` and `sha256*Async` utils

[pi0]

Resolves #25

Add a new asyncHash to leverage the native platform hashing mechanism using SubtleCrypto digest(). When not available, ohash falls back to js implementation.

Benchmarks:

local run node benchmark/hash.mjs

(with the exception of a few items, it is not faster, than investigating..)

[codecov[bot]]

Codecov Report

Merging #41 (930c4d3) into main (9f2fd38) will increase coverage by 0.28%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
+ Coverage   80.53%   80.81%   +0.28%     
==========================================
  Files           8        8              
  Lines         981     1006      +25     
  Branches      126      132       +6     
==========================================
+ Hits          790      813      +23     
- Misses        191      193       +2     

Impacted Files	Coverage Δ
src/hash.ts	95.00% <92.00%> (-5.00%)	:arrow_down:
src/index.ts	100.00% <100.00%> (ø)

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[pi0]

(update: renaming to hashAsync thanks to @danielroe idea)

[pi0]

canceling in favor of #100