pubsub: Refactor Event Subscription (#6634)

libs/pubsub/query/empty.go

@@ -1,11 +1,15 @@
 package query
 
+import (
+	"github.com/tendermint/tendermint/abci/types"
+)
+
 // Empty query matches any set of events.
 type Empty struct {
 }
 
 // Matches always returns true.
-func (Empty) Matches(tags map[string][]string) (bool, error) {
+func (Empty) Matches(events []types.Event) (bool, error) {
 	return true, nil
 }