Add `LE Read Resolving List Size Command`

[jmarkstar]

The LE_Read_Resolving_List_Size command is used to read the total number of address translation entries in the resolving list that can be stored in the Controller. Note: The number of entries that can be stored is not fixed and the Controller can change it at any time (e.g. because the memory used to store the list can also be used for other purposes).