feat: enable GRPC server reflection (#2173)

Closes #2172

## Testing

```
$ grpcurl -plaintext 127.0.0.1:9098 list
grpc.reflection.v1.ServerReflection
grpc.reflection.v1alpha.ServerReflection
tendermint.rpc.grpc.BlobstreamAPI
tendermint.rpc.grpc.BlockAPI
tendermint.rpc.grpc.BroadcastAPI
```

Author: rootulp

rpc/grpc/client_server.go

@@ -6,6 +6,7 @@ import (
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/reflection"
 
 	cmtnet "github.com/cometbft/cometbft/libs/net"
 	"github.com/cometbft/cometbft/rpc/core"
@@ -27,14 +28,14 @@ func StartGRPCServer(env *core.Environment, ln net.Listener) error {
 	grpcServer := grpc.NewServer()
 	RegisterBroadcastAPIServer(grpcServer, &broadcastAPI{env: env})
 
-	// block api
 	api := NewBlockAPI(env)
 	RegisterBlockAPIServer(grpcServer, api)
 
-	// blobstream api
 	blobstreamAPI := NewBlobstreamAPI(env)
 	RegisterBlobstreamAPIServer(grpcServer, blobstreamAPI)
 
+	reflection.Register(grpcServer)
+
 	errCh := make(chan error, 2)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()