* BestParaHead small changes

Signed-off-by: Serban Iorga <[email protected]>

* Renamings

Signed-off-by: Serban Iorga <[email protected]>

* Use ParaInfo in parachains loop

Signed-off-by: Serban Iorga <[email protected]>

* Define StorageMapKeyProvider

Signed-off-by: Serban Iorga <[email protected]>

* CR fixes

Signed-off-by: Serban Iorga <[email protected]>