* contracts-bedrock: cleanup `FeeVault`

Updates the `FeeVault` to follow modern conventions used in the repo
by moving to usage of interfaces rather than implementations. Also
moves the `FeeVault` into the `L2` package as its only really useful
on L2. This is meant to reduce the diff for the Stanard L2 Genesis
by breaking up the refactor into its own small PR.

* contracts: update semver-lock

* semver-lock: fixup

* cleanup: refactor

* lint: fix

* snapshots: regenerate

* interface check: ignore fee vaults

There is an issue with normalization of enums when they are return
values