Query versioning for dispute resolution

[abarmat]

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Motivation

This change to the Dispute Manager is intended to allow multiple query attestation formats that involve different query versions as described in this GIP https://forum.thegraph.com/t/gip-0024-query-versioning/3145

Changes

• Add a bytes32 domainSeparator field to the attestation payload submitted on both createQueryDispute and createQueryDisputeConflict.
• Use the passed domainSeparator to build the message hash used for recovering the signer.
• Deprecate the domain separator with fixed versioning from the contract storage.

[abarmat]

These are still not consistent. Some end with SIZE_LENGTH and some with LENGTH

Pushed once more, now we are fully consistent

[codecov[bot]]

Codecov Report

Merging #548 (a48c42d) into dev (3541624) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #548      +/-   ##
==========================================
- Coverage   91.19%   91.18%   -0.02%     
==========================================
  Files          37       37              
  Lines        1795     1792       -3     
  Branches      293      293              
==========================================
- Hits         1637     1634       -3     
  Misses        158      158              

Flag	Coverage Δ
unittests	91.18% <100.00%> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
contracts/disputes/DisputeManager.sol	99.30% <100.00%> (-0.02%)	:arrow_down:

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[pcarranzav]

This PR has become quite outdated and would need a big refactor to get merged. I'll close it and we can use it as a reference for a new PR if the corresponding proposal is reactivated.