api: add ID to CreateCommandData

[Benbebop]

CreateCommandData doesn't have an ID parameter, adding it allows you to rename commands with BulkOverwriteCommands and BulkOverwriteGuildCommands.

func main() {
	client := api.NewClient("Bot " + token)

	var cmds []api.CreateCommandData
	cmds = append(cmds, api.CreateCommandData{
		Type:        1,
		Name:        "newcommand",
		Description: "this is a fresh new command",
	})

	app, _ := client.CurrentApplication()

	newCmds, _ := client.BulkOverwriteGuildCommands(app.ID, testGuild, cmds)

	fmt.Printf("%d, '%s', '%s'\n", newCmds[0].ID, newCmds[0].Name, newCmds[0].Description)

	cmds[0] = api.CreateCommandData{
		ID:          newCmds[0].ID,
		Type:        1,
		Name:        "replacedcommand",
		Description: "this is an overwritten command",
	}

	newCmds, _ = client.BulkOverwriteGuildCommands(app.ID, testGuild, cmds)

	fmt.Printf("%d, '%s', '%s'\n", newCmds[0].ID, newCmds[0].Name, newCmds[0].Description)

	client.DeleteGuildCommand(app.ID, guildID, newCmds[0].ID)
}

1193307101997580370, 'newcommand', 'this is a fresh new command'
1193307101997580370, 'replacedcommand', 'this is an overwritten command'