fix: verify CAR blocks with all supported hashes

[alanshaw]

Adds the verifier library so that CARs with blocks that are hashed with a supported hasher other than sha2-256 are also verified.

[cloudflare-workers-and-pages]

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Latest commit:	81ca8bc
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Preview URL:	https://4494fe5f.nft-storage-1at.pages.dev
Branch Preview URL:	https://fix-verify-car-blocks.nft-storage-1at.pages.dev

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[codecov-commenter]

Codecov Report

Merging #2460 (573815e) into main (bcc90dd) will not change coverage.
Report is 8 commits behind head on main.
The diff coverage is n/a.

❗ Current head 573815e differs from pull request most recent head 81ca8bc. Consider uploading reports for the commit 81ca8bc to get more accurate results

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@@            Coverage Diff            @@
##              main     #2460   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files            5         5           
  Lines         1303      1324   +21     
=========================================
+ Hits          1303      1324   +21     

see 2 files with indirect coverage changes

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