Pause PXE syncing while simulating a tx

[spalladino]

World state should not change halfway through a simulation, or we can get undefined behaviour. We should either stop syncing, or accumulate sync changes in a buffer that we don't flush until we've finished simulation, or take a snapshot for the purpose of the simulation.

aztec-packages/yarn-project/pxe/src/pxe_service/pxe_service.ts

Line 456 in bd8d004

// TODO - Pause syncing while simulating.