Add ERC1967 / UUPS to Castle and Clerk

[sadhbh-c0d3]

Castle and Granary contracts are designed to be deployed as UUPS implementation for Gate (ERC1967 proxy).

TODO:

• Add updateToAndCall() method to Castle

• Add updateToAndCall() method to Granary

• Find out if we want to use OpenZeppelin as we did for Treasury or we want to keep it slim.

[sadhbh-c0d3]

Also need to make others upgradeable (Factor, Banker, Guildmaster, Scribe, Worksman)

[sadhbh-c0d3]

Modular upgradeability is essential for streamlined development and hot fixes.