This is a large diff, yet should have exactly zero functional changes
Ideally as a result of this some parts of the depchain will become lighter,
with downstream reaping the same benefits as the team that initiated this split.
P.S. work was done while forming better intuition of current dependency graph
Otherwise, an account will need funds to estimate the max possible gas a
message could take (which is usually the block gas limit).
This does mean gas estimation no longer checks if the sending account
has enough funds to cover the message cost, but MpoolPush will now do
this.
