feat(sdk): As a Developer, I want the SDK to be compatible with the new version of the subgraph

[alainncls]

What does this PR do?

1. Migrates the SDK from subgraph v1 to subgraph v2
2. Upgrades the SDK for the explorer

Consequences:

• Breaking changes with a new Attestation type
• Way less calls to the subgraph to get Attestations (from up to 301 calls to display 100 Attestations to only 1 call)

Remaining work:

• Deploy SDK v2 on npm with the 'beta' tag
• Replace all the subgraph v1 URLs to subgraph v2 URLs in the SDK configs
• Improve the integration tests at the SDK level
• Warn the builders of the breaking changes

Related ticket

Fixes #585

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (e99f776) to head (ffcfac3).
Report is 9 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #695      +/-   ##
==========================================
+ Coverage   92.07%   94.54%   +2.47%     
==========================================
  Files          30       30              
  Lines         492      495       +3     
  Branches      112      112              
==========================================
+ Hits          453      468      +15     
+ Misses         39       27      -12     

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[github-actions]

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