title: Enable collators to build on multiple cores

doc:
  - audience: Node Dev
    description: |
      Introduces a `CoreIndex` parameter in `SubmitCollationParams`. This enables
      the collators to make use of potentially multiple cores assigned at some relay
      chain block. This extra parameter is used by the collator protocol and collation
      generation subsystems to forward the collation to the approapriate backing group.

crates:
- name: polkadot-node-collation-generation
- name: polkadot-collator-protocol
  bump: minor