Enforce specifying the bump type alongside the name of the crate being bumped

[liamaharon]

e.g. instead of writing

crates: 
  - name: pallet-balances
  - name: sp-io
  - name: remote-externalities

you'd write something like

crates:
  - pallet-balances minor
  - sp-io patch
  - remote-externalities major

Where the bump type can be major minor or patch.

This will be a key part of maintaining correct semver bumps once we switch to the new release process with stable/prerelease branches.

[liamaharon]

Wrong repo paritytech/polkadot-sdk#3816