Add support for transaction to update validator score parameters

[soerenbf]

Purpose

Adds support for the new chain update introduced in protocol version 8

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.

[soerenbf]

Getting the ledger guidelines workflow to pass is out of scope of this PR, as the changes introduced have nothing to do with the main concordium app.

The tests all pass for the nano s cases, but nano s+ and nano x fail due to some docker connection being closed prematurely...