feat: add endpoint to return snapit metadata

[wa0x6e]

Pitch: https://www.notion.so/snapshotlabs/NFT-claimer-metadata-597d55cfba5a44d8906256be757d398d

Add endpoint to return the JSON metadata used by the NFT tokenURI

Todo later

• Metadata should be a JSON file, uploaded to a static server

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (41f377f) 56.26% compared to head (6b15c93) 55.30%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
- Coverage   56.26%   55.30%   -0.97%     
==========================================
  Files          19       20       +1     
  Lines        1619     1658      +39     
  Branches      120      121       +1     
==========================================
+ Hits          911      917       +6     
- Misses        697      729      +32     
- Partials       11       12       +1     

Files	Coverage Δ
src/helpers/snapshot.ts	91.35% <100.00%> (+0.28%)	⬆️
src/api.ts	0.00% <0.00%> (ø)
src/lib/nftClaimer/metadata.ts	0.00% <0.00%> (ø)

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