types: rename and extend the EventData interface (#7687)

This is the interface shared by types that can be used as event data in, for
example, subscriptions via the RPC.

To be compatible with the RPC service, data need to support JSON encoding.
Require this as part of the interface.

internal/pubsub/subscription.go

@@ -5,8 +5,9 @@ import (
 	"errors"
 
 	"github.com/google/uuid"
-	"github.com/tendermint/tendermint/abci/types"
+	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/internal/libs/queue"
+	"github.com/tendermint/tendermint/types"
 )
 
 var (
@@ -73,8 +74,8 @@ func (s *Subscription) stop(err error) {
 // Message glues data and events together.
 type Message struct {
 	subID  string
-	data   interface{}
-	events []types.Event
+	data   types.EventData
+	events []abci.Event
 }
 
 // SubscriptionID returns the unique identifier for the subscription
@@ -82,7 +83,7 @@ type Message struct {
 func (msg Message) SubscriptionID() string { return msg.subID }
 
 // Data returns an original data published.
-func (msg Message) Data() interface{} { return msg.data }
+func (msg Message) Data() types.EventData { return msg.data }
 
 // Events returns events, which matched the client's query.
-func (msg Message) Events() []types.Event { return msg.events }
+func (msg Message) Events() []abci.Event { return msg.events }