fix(utils): synchronous version of sha256 digest

[simonas-notcat]

What issue is this PR fixing

Native browser crypto API is async
We need a sync version of sha256 for the computeEntryHash method.

https://stackoverflow.com/a/73600052

Quality

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• I want these changes to be integrated
• I successfully ran pnpm i, pnpm build, pnpm test, pnpm test:browser locally.
• I allow my PR to be updated by the reviewers (to speed up the review process).
• I added unit tests.
• I added integration tests.
• I did not add automated tests because _________, and I am aware that a PR without tests will likely get rejected.

Details

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (e2e794f) 84.93% compared to head (5396c5e) 84.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1253      +/-   ##
==========================================
- Coverage   84.93%   84.93%   -0.01%     
==========================================
  Files         167      167              
  Lines       18132    18131       -1     
  Branches     2036     2036              
==========================================
- Hits        15400    15399       -1     
  Misses       2732     2732              

Files Changed	Coverage Δ
packages/utils/src/credential-utils.ts	100.00% <100.00%> (ø)

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[mirceanis]

Looks good.

If we decide to revert the CID stuff (#1239), we'll have to revert this PR too.