Migrate/adapt `epoch_setting` table

## Issue
Migrate the protocol parameters store to a new `epoch_setting` table

## Methodology
- Prepare migration script (data structure creation + data migration) + (destruction previous store, maybe later)
- Update the existing store (adapter modification only) if it is possible
- Create a new store otherwise
- Adapt/refactor runtime and/or http server to use the new store

## Parent issue
#779 