Enable non consecutive ForkID jumps

[arnaubennassar]

Rationale

Right now the node prevents fork ID upgrades that are not consecutive in number:

                // Check to detect forkID inconsistencies
		if forkIDs[len(forkIDs)-1].ForkId+1 != newForkID.ForkId {
			log.Errorf("error checking forkID sequence. Last ForkID stored: %d. New ForkID received: %d", forkIDs[len(forkIDs)-1].ForkId, newForkID.ForkId)
			return fmt.Errorf("error checking forkID sequence. Last ForkID stored: %d. New ForkID received: %d", forkIDs[len(forkIDs)-1].ForkId, newForkID.ForkId)
		}

Why should this feature exist?

To allow CDKs that want to move from forkID X to fork ID Y where Y !== X+1

Implementation

Just remove the code mentioned above, or maybe change log level to warning and do not through error