[#808] cli: Use EnableTraverseRunHooks in cobra

Adopt EnableTraverseRunHooks to get rid of tracing boilerplate in
multiple commands. Now adding `--trace` flag is sufficient for a command
to support tracing. Finally, it looks how it _should_.

Refs #406

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-cli/modules/root.go

@@ -46,6 +46,10 @@ of frostfs-api and some useful utilities for compiling ACL rules from JSON
 notation, managing container access through protocol gates, querying network map
 and much more!`,
 	Run: entryPoint,
+	PersistentPreRun: func(cmd *cobra.Command, _ []string) {
+		common.StartClientCommandSpan(cmd)
+	},
+	PersistentPostRun: common.StopClientCommandSpan,
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
@@ -57,6 +61,7 @@ func Execute() {
 
 func init() {
 	cobra.OnInitialize(initConfig)
+	cobra.EnableTraverseRunHooks = true
 
 	// use stdout as default output for cmd.Print()
 	rootCmd.SetOut(os.Stdout)