Celo-specific commits (initial CGT support):
- Revert "contracts-bedrock: remove GCT code (ethereum-optimism#13921)" by @pahor167 in 6a4ddb8
- Revert "chore: removal of unused system config inputs (ethereum-optimism#13773)" by @pahor167 in 4170f26
- Revert "remove CGT code (ethereum-optimism#13686)" by @pahor167 in cede3f9
- snapshot by @pahor167 in ddedc77
- Revert CustomGasTokenNotSupported in OptimismPortal2 by @pahor167 in 0c71217
- Removal of CustomGasTokenNotSupported() error by @pahor167 in cdba802
Full Changelog: celo-contracts/v1.9.1-v1.8.0...celo-contracts/v2.0.0