Change ordered events key and values to actuall felts instead of pointers to felts

[rodrigo-pino]

As the tile says, in vm/trace.go, the struct definition:

type OrderedEvent struct {
	Order uint64       `json:"order"`
	From  *felt.Felt   `json:"from_address,omitempty"`
	Keys  []*felt.Felt `json:"keys"`
	Data  []*felt.Felt `json:"data"`
}

Has the fields Key and Data as pointers of felts. Ideally they are directly array of felts and all the changes directly with them are applied.

End result

type OrderedEvent struct {
	Order uint64      `json:"order"`
	From  *felt.Felt  `json:"from_address,omitempty"`
	Keys  []felt.Felt `json:"keys"`
	Data  []felt.Felt `json:"data"`
}