[Maikol]

Moves GraphToken, L2GraphToken, TokenUtils and the Arbitrum bridge contracts from packages/contracts into packages/graph-token, which becomes a publishable package with its own Hardhat 0.7.6 build, and horizon and subgraph-service now import TokenUtils from there. pnpm check:bytecode still matches all 21 deployed contracts ignoring metadata.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.74%. Comparing base (968e50a) to head (8631858).
⚠️ Report is 3 commits behind head on chore/contracts-removal-phase-0.

Additional details and impacted files

@@                       Coverage Diff                        @@
##           chore/contracts-removal-phase-0    #1395   +/-   ##
================================================================
  Coverage                            98.74%   98.74%           
================================================================
  Files                                   39       39           
  Lines                                 2699     2699           
  Branches                               477      477           
================================================================
  Hits                                  2665     2665           
  Misses                                  13       13           
  Partials                                21       21           

Flag	Coverage Δ
unittests	98.74% <ø> (ø)

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