Compare and document exact differences between Token & Timelock compared to Alpha Interfaces

[apbendi]

We should use cast to generate the interfaces for the POOL token and Timelock and compare them to the expected interfaces in the OZ contracts, documenting all differences and the impact they will have. This might require us to vendor in customized versions of the OZ contracts to support the ABI differences compared to a standard Governor Alpha deployment.

First identified by @alexkeating here and here.

[alexkeating]

The only spot I see the token being used here which the POOL token supports.

This may be an unwarranted worry, but are we worried that there could be future issues because the interface is to fully compatible with the actual token.