Support complex lock strategies in atomic execution protocol

[adlrocha]

In the current implementation, all messages of the execution should affect the same method, and we don't give a way to easily lock different parts of the state of an actor according to the params of each of this messages, we just look to the first message and lock according (and execute) according to the method and params it has. We should generalize this approach to allow the locking and execution of any number of messages and params in an actor.

eudico/chain/consensus/hierarchical/atomic/exec/exec.go

Lines 151 to 154 in cb44e61

	// FIXME: We are using here the method and params from the first message.
	// This works because we are currently using a really simple LockableActor,
	// this will need to be further generalized when we introduce new actors.
	lparams, err := atomic.WrapSerializedParams(msgs[0].Method, msgs[0].Params)

eudico/chain/consensus/hierarchical/subnet/manager/atomic.go

Line 48 in cb44e61

// FIXME: Disregarding params to lock for now