Primed for suspension

[drsk0]

Purpose

This is the implementation of automatic suspension for validators that missed too many rounds. Suspension happens at snapshot, while priming new validators for suspension at payday.

We compute the to be suspended validators during epoch transition at snapshot before we prime validators for future suspension. This is to avoid priming and then immediately suspending validators when the length of the payday is one.

Changes

• two block state operations: bsoPrimeValidators and bsoSuspendValidators
• automatic suspend logic in the scheduler
• change computeBakerStakesAndCapital to ignore newly suspended validators at snapshot
• a bit of boilerplate code for the chain parameters version 3 slipped in this PR
• tests

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

CLA acceptance

_Remove if not applicable.

By submitting the contribution I accept the terms and conditions of the
Contributor License Agreement v1.0

• link: https://developers.concordium.com/CLAs/Contributor-License-Agreement-v1.0.pdf

• I accept the above linked CLA.

[td202]

Looks good. Just a few changes.

[eb-concordium]

Looks good to me (modulo existing comments)! 💪

td202 is on holiday, all requested changes have been discussed/implemented.