[#521] cli: Add common aliases to policy playground commands

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

cmd/frostfs-cli/modules/container/policy_playground.go

@@ -183,10 +183,12 @@ func (repl *policyPlaygroundREPL) run() error {
 	}
 
 	cmdHandlers := map[string]func([]string) error{
+		"list":   repl.handleLs,
 		"ls":     repl.handleLs,
 		"add":    repl.handleAdd,
 		"load":   repl.handleLoad,
 		"remove": repl.handleRemove,
+		"rm":     repl.handleRemove,
 		"eval":   repl.handleEval,
 	}
 	for reader := bufio.NewReader(os.Stdin); ; {