Unified types with internal, Yearn client

Changes:

1. AssetValue is imported from barretenberg instead of using the local one,
2. since AssetValue in barretenberg was a bit different from the local one (value instead of amount, number assetId instead of bigInt) basically all the clients had to be refactored to reflect this,
3. added Yearn client,
4. refactored getAPR function to have only the vault asset on input,
5. Element client uses getTermAPR instead of getAPR function,
6. BridgeDataFieldGetters inteface was expanded withgetTermAPR.