refactor: Use an addresses provider for the l1 contracts

[LHerskind]

The current configurations and setup of l1 addresses is a pain in the ass, so many environment variables being passed around where it is not really meaningful for anyone to change them at this stage and some of them never. Think it would be much simpler for the setups if we create a small addresses provider contract that is the only to be set as env variable and the rest can then be read from it. Plenty of the addresses are already linked in contracts so might as well create 1 that is dealing with it for simplicity.