ERC721 mint by quantity V2

[drinkcoffee]

Changes:

• Made a copy of ImmutableERC721 contract and dependant contracts and called them V2 contracts. The only major differences are in the ERC721PSIV2 and ERC721PSIBurnable contracts.
• Added interfaces for ERC721 contracts, so common features for contracts can sit behind an interface. This has allowed for the same tests to be used across implementations.
• Migrated ERC721 HardHat tests to Forge.
• Added many additional tests to improve test coverage.
• Added perfTest directory, that includes test that check the gas efficiency of ERC721 contract implementations.