feat(warp): warp sync

[Trantorian1]

Is there an existing issue?

• I have searched the existing issues

Motivation

Current l2 is mostly compute-bound by the time it take to calculate the state root of a block. This is necessary once we have reached the tip of the chain but not while we are synchronizing.

Request

Improve L2 sync times.

Solution

Add a cli option --warp-sync which computes the state root only at the end of synchronization. This has the advantage that blocks can be synchronized much faster, at the cost that any invalid/malicious information will only be detected once we have reached the tip of the chain.

This should also be applied to #393 during warp updates as we are synchronizing from a trusted source anyway.

Are you willing to help with this request?

Yes!