feat(Snapshot): Expose Snapshot tree for sandbox tests + use in e2e tests

[rahul-kothari]

From Lasse:
One of the really nice testing features to have for the sandbox would be reverting the state back to a certain snapshot.

With the snapshotted trees (and also use snapshots of the anvil state), we should be able to send a command that "rollback" to the specified snapshot (both L1 and L2 state).
This could be used to heavily reduce testing times where there is a lot of repetitive setup. As you would just do a snapshot in beforeEach and a cheatcode.rollback() in the afterEach().

For tests that are going back and deploying the full setup at every single iteration this should be a massive speedup.

Definition of Done:

• e2e tests use these to speed them up
• In process of doing so, we might end up creating methods to easily use the snapshot tree. This should be documented - Seek devrel's help for this