chore: upstream more changes from v2 (#20387)

Co-authored-by: Matt Kocubinski <mkocubinski@gmail.com>

server/v2/streaming/examples/stdout/stdout.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hashicorp/go-plugin"
+
+	"cosmossdk.io/server/v2/streaming"
+)
+
+// StdoutPlugin is the implementation of the ABCIListener interface
+// For Go plugins this is all that is required to process data sent over gRPC.
+type StdoutPlugin struct {
+	BlockHeight int64
+}
+
+func (a *StdoutPlugin) ListenDeliverBlock(ctx context.Context, req streaming.ListenDeliverBlockRequest) error {
+	a.BlockHeight = req.BlockHeight
+	// process tx messages (i.e: sent to external system)
+	fmt.Printf("listen-finalize-block: block-height=%d req=%v res=%v", a.BlockHeight, req, nil)
+	return nil
+}
+
+func (a *StdoutPlugin) ListenStateChanges(ctx context.Context, changeSet []*streaming.StoreKVPair) error {
+	// process block commit messages (i.e: sent to external system)
+	fmt.Printf("listen-commit: block_height=%d res=%v data=%v", a.BlockHeight, changeSet, nil)
+	return nil
+}
+
+func main() {
+	plugin.Serve(&plugin.ServeConfig{
+		HandshakeConfig: streaming.Handshake,
+		Plugins: map[string]plugin.Plugin{
+			"abci": &streaming.ListenerGRPCPlugin{Impl: &StdoutPlugin{}},
+		},
+
+		// A non-nil value here enables gRPC serving for this streaming...
+		GRPCServer: plugin.DefaultGRPCServer,
+	})
+}