Add fail safe delegate banning mechanism

[shuse2]

Description

Add a "fail safe" delegate banning mechanism to ban un-productive delegates from forging selection.

Motivation

Refer https://github.com/LiskHQ/lips/blob/master/proposals/lip-0023.md#delegate-productivity

Tasks

Sprint 21

• Update DPoS library to calculate consecutiveMissedBlocks Update DPoS library to calculate consecutiveMissedBlocks #4934
• Update DPoS library to calculate and undo last forged height Update DPoS library to calculate last forged height #4935
• Update DPoS library to ban or unban when conditions are met Update DPoS library to ban when conditions are met #4942

Additional Information

This feature is complex to implement without automatic undo because it needs to track historical changes of lastForgedHeight and consecutiveMissedBlocks.