explicitly throw an error when crypto.subtle is undefined

[pamapa]

Closes/fixes #1299

Checklist

• This PR makes changes to the public API
• I have included links for closing relevant issue numbers

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (9380b18) 78.42% compared to head (287a433) 78.33%.

Files	Patch %	Lines
src/utils/CryptoUtils.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1300      +/-   ##
==========================================
- Coverage   78.42%   78.33%   -0.10%     
==========================================
  Files          45       45              
  Lines        1729     1731       +2     
  Branches      343      344       +1     
==========================================
  Hits         1356     1356              
- Misses        336      338       +2     
  Partials       37       37              

Flag	Coverage Δ
unittests	78.33% <0.00%> (-0.10%)	⬇️

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[pamapa]

@43081j Please review this small changes. The idea is to avoid people complaining its undefined when they are using not secure contexts...

[43081j]

makes sense to me, good catch!