feat: As a user, I want to get decoded tuples from Attestation data via the subgraph

[alainncls]

What does this PR do?

1. Decodes attestation payloads containing tuples at the subgraph level
2. Fix a decoding issue on bytes type

Related ticket

Fixes #236

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.53%. Comparing base (69fc4de) to head (b2b8aa4).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #613   +/-   ##
=======================================
  Coverage   92.53%   92.53%           
=======================================
  Files          30       30           
  Lines         482      482           
  Branches      114      114           
=======================================
  Hits          446      446           
  Misses         24       24           
  Partials       12       12           

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