Lh/deployments

[LHerskind]

Description

Add a base contract that can be used for writing deployment scripts. The base contains helper functions for listing assets or bridges and getters for the addresses of the rollup processor address.

Checklist:

• [x] I have reviewed my diff in github, line by line.
• [x] Every change is related to the PR description.
• [x] There are no unexpected formatting changes, or superfluous debug logs.
• [x] The branch has been rebased against the head of its merge target.
• [x] I'm happy for the PR to be merged at the reviewers next convenience.
• [x] NatSpec documentation of all the non-test functions is present and is complete.
• [x] Continuous integration (CI) passes.
• [x] Command forge coverage --match-contract MyContract returns 100% line coverage.
• [x] All the possible reverts are tested.