OnReceived hook for pallet-balances

[xlc]

We would like to have an OnReceived hook to do something when an account received some funds.

For now we will be just wrap StoredMap to achieve similar result

substrate/frame/system/src/lib.rs

Line 1276 in 7fccdfa

impl<T: Trait> StoredMap<T::AccountId, T::AccountData> for Module<T> {

Required by AcalaNetwork/Acala#236

[xlc]

Just found out there is StorageMapShim that basically does the wrap StoredMap work so we don't need this anymore.