pub fn migrate<T: Config, P: GetStorageVersion + PalletInfoAccess>() -> Weight
Migrate the entire storage of this pallet to a new prefix.
This new prefix must be the same as the one set in construct_runtime.
The migration will look into the storage version in order not to trigger a migration on an up to date storage. Thus the on chain storage version must be less than 1 in order to trigger the migration.