SuperchainERC20: Factory Spec

[tynes]

The specs need to be updated with the SuperchainERC20Factory spec. We know some things about this factory but still need to make some decisions. This factory should make it really easy to spin up interoperable tokens across the superchain

• Is is a predeploy, what is its address?
• It should be create3 based to prevent coupling to bytecode
• Where should the bytecode live that ends up being deployed? A predeploy?
• The salt should commit to the unique erc20 properties - name, symbol, decimals
• Should the salt also commit to a version? Leaves open to add extensions to the interface in the future

[tynes]

There is a big design space here, its possible that we may want to limit the scope to supporting #10899

[0xParticle]

We are discussing the base design in the following Design Doc PR. We will move into a spec once the Liquidity Migration Spec is merged.

[0xParticle]

ethereum-optimism/specs#332