ZRC20 lock/unlock should not depend on ZRC20 being passed as parameter

[fbac]

Describe the Issue
Current implementation expects the ZRC20 ABI to be passed as parameter:

func (k Keeper) LockZRC20(
	ctx sdk.Context,
	zrc20ABI *abi.ABI,
	zrc20Address, spender, owner, locker common.Address,
	amount *big.Int,
) error

Expected Outcome
Ideally the API should be capable of getting the ZRC20 on its own. So a caller doesn't have to know anything about ZRC20.

[UniDrills]

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