pd-ctl: support StartKeyspaceID and EndKeyspaceID parameters

[binshi-bing]

Enhancement Task

root@serverless-cluster-pd-0:/# ./pd-ctl keyspace-group split help
Usage:
pd-ctl keyspace-group split <keyspace_group_id> <new_keyspace_group_id> [<keyspace_id>] [flags]

// SplitKeyspaceGroupByIDParams defines the params for splitting a keyspace group.
type SplitKeyspaceGroupByIDParams struct {
	NewID     uint32   `json:"new-id"`
	Keyspaces []uint32 `json:"keyspaces"`
	// StartKeyspaceID and EndKeyspaceID are used to indicate the range of keyspaces to be split.
	StartKeyspaceID uint32 `json:"start-keyspace-id"`
	EndKeyspaceID   uint32 `json:"end-keyspace-id"`
}

func splitKeyspaceGroupCommandFunc(cmd *cobra.Command, args []string) {
	if len(args) < 3 {
		cmd.Usage()
		return
	}
	_, err := strconv.ParseUint(args[0], 10, 32)
	if err != nil {
		cmd.Printf("Failed to parse the old keyspace group ID: %s\n", err)
		return
	}
	newID, err := strconv.ParseUint(args[1], 10, 32)
	if err != nil {
		cmd.Printf("Failed to parse the new keyspace group ID: %s\n", err)
		return
	}
	keyspaces := make([]uint32, 0, len(args)-2)
	for _, arg := range args[2:] {
		id, err := strconv.ParseUint(arg, 10, 32)
		if err != nil {
			cmd.Printf("Failed to parse the keyspace ID: %s\n", err)
			return
		}
		keyspaces = append(keyspaces, uint32(id))
	}
	postJSON(cmd, fmt.Sprintf("%s/%s/split", keyspaceGroupsPrefix, args[0]), map[string]interface{}{
		"new-id":    uint32(newID),
		"keyspaces": keyspaces,
	})