feat(cmd): snapshots command (backport #2825) (#2828)

This is an automatic backport of pull request #2825 done by
[Mergify](https://mergify.com).


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Co-authored-by: Rootul P <rootulp@gmail.com>

cmd/celestia-appd/cmd/root.go

@@ -22,6 +22,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	"github.com/cosmos/cosmos-sdk/client/keys"
 	"github.com/cosmos/cosmos-sdk/client/rpc"
+	"github.com/cosmos/cosmos-sdk/client/snapshot"
 	"github.com/cosmos/cosmos-sdk/server"
 	serverconfig "github.com/cosmos/cosmos-sdk/server/config"
 	servertypes "github.com/cosmos/cosmos-sdk/server/types"
@@ -142,6 +143,9 @@ func initRootCmd(rootCmd *cobra.Command, encodingConfig encoding.Config) {
 		keys.Commands(app.DefaultNodeHome),
 		qgbcmd.VerifyCmd(),
 	)
+	rootCmd.AddCommand(
+		snapshot.Cmd(NewAppServer),
+	)
 }
 
 func addModuleInitFlags(startCmd *cobra.Command) {