To prevent issues with the immutable reference config for the L2 genesis
generation going stale, add in explicit checks based on the solc
compiler output. This is done by adding the solc output
`immutableReferences` directly to the `_more.go` files in the bindings
and accumulating all of them into a mapping in an init function. Then
the immutables config is given typing, previously it was generic for
simplicity. Now that it has typing, it is possible to ensure that all of
the fields are set. It also uses the `reflect` package to remove
footguns for the developer as new predeploys are added to L2.
The tests should fail if there is a new predeploy added that does
not have immutable config added.