title: Configurable block number provider in pallet-vesting

doc:
  - audience: Runtime Dev
    description: |
      Adds `BlockNumberProvider` type to pallet-vesting Config trait, allowing for custom providers instead of hardcoding frame-system.
      This is particularly useful for parachains wanting to use `cumulus_pallet_parachain_system::RelaychainDataProvider` with `pallet-vesting`.

crates: [ ]