Add custom TokenPool contracts for GHO

[miguelmtzinf]

Based on community's discussions regarding the strategy for cross-chain GHO and the consensus to utilize Chainlink Cross-Chain Interoperability Protocol (CCIP) as the initial bridge, new facilitator contracts have been developed to enable the bridging of GHO from Ethereum to other networks.

These new contracts, UpgradeableBurnMintTokenPool and UpgradeableLockReleaseTokenPool, are built on top of CCIP contracts BurnMintTokenPool and LockReleaseTokenPool respectively, with the following modifications:

• Minor alterations to the CCIP v2.8.0 release to resolve compatibility issues (Tune TokenPool contracts to make it compatible with gho-core ccip#1).
• Introduction of upgradeability mechanism using the battle-tested transparent proxy pattern (VersionedInitializable and TransparentUpgradeableProxy).
• Disable of allowlist feature given that it is not necessary for the GHO use case.

This PR includes tests specifically focused on the newly introduced upgradeability mechanism, while this CCIP PR contains a more extensive test suite for CCIP functionalites.

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[miguelmtzinf]

Closing this one given that all development artifacts can be found on the forked repository of CCIP, specifically in this PR.