Introducing SuspensionInfo and suspension chain parameters

[drsk0]

Purpose

These are the corresponding changes for the newly introduced validator suspension chain parameters in the node repo. Also a data structure SuspensionInfo is introduced that gathers the missed rounds and whether a validator is primed for suspension at the next snapshot.

Changes

See above

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]

Base submodule requires updating.

[drsk0]

I'll update base as soon as the corresponding PR's there are merged.

[td202]

Looks good!