feat: add Arbitrum GRT bridge (rebased, bridge only)

[pcarranzav]

Deployment commands in the CLI are also updated to include an L2 deployment.
Configuration and address book entries for Arbitrum are added as well.

This is a rebase of #552 and related PRs, including only the bridge (no changes to staking or rewards).

The changes in this PR correspond to GIP-0031

[codecov]

Codecov Report

Base: 90.57% // Head: 91.59% // Increases project coverage by +1.01% 🎉

Coverage data is based on head (d35acb6) compared to base (3605081).
Patch coverage: 98.98% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #699      +/-   ##
==========================================
+ Coverage   90.57%   91.59%   +1.01%     
==========================================
  Files          35       42       +7     
  Lines        1762     1999     +237     
  Branches      296      361      +65     
==========================================
+ Hits         1596     1831     +235     
- Misses        166      168       +2     

Flag	Coverage Δ
unittests	91.59% <98.98%> (+1.01%)	⬆️

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

Impacted Files	Coverage Δ
contracts/curation/Curation.sol	100.00% <ø> (ø)
contracts/governance/Pausable.sol	88.88% <ø> (ø)
contracts/governance/Managed.sol	94.54% <85.71%> (-3.54%)	⬇️
contracts/upgrades/GraphProxyStorage.sol	90.00% <87.50%> (+0.52%)	⬆️
contracts/gateway/BridgeEscrow.sol	100.00% <100.00%> (ø)
contracts/gateway/GraphTokenGateway.sol	100.00% <100.00%> (ø)
contracts/gateway/L1GraphTokenGateway.sol	100.00% <100.00%> (ø)
contracts/governance/Controller.sol	100.00% <100.00%> (ø)
contracts/governance/Governed.sol	100.00% <100.00%> (ø)
contracts/l2/gateway/L2GraphTokenGateway.sol	100.00% <100.00%> (ø)
... and 6 more

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[socket-security]

Socket Security Pull Request Report

Dependency issues detected. If you merge this pull request, you will not be alerted to the instances of these issues again.

📜 Install scripts

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

Packages should not be running non-essential scripts during install and there are often solutions to problems people solve with install scripts that can be run at publish time instead.

Package	Script field	Source
[email protected] (upgraded)	postinstall	package.json

Pull request report summary

Issue	Status
Install scripts	⚠️ 1 issue
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[abarmat]

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