Support a `@ExecuteDefault` in command clasases to show usage originally

[CarmJos]

Sometimes we want to display originally usages to players instead of auto-generated one, so maybe we could support a annotation like @UsageExecute used in command classes, which will be called in "No command found" situtation, to replace the generated messages (by SchematicFormat usually).

It looks like this:

package com.artformgames.plugin.tempflight.command;

import dev.rollczi.litecommands.annotations.argument.Arg;
import dev.rollczi.litecommands.annotations.command.Command;
import dev.rollczi.litecommands.annotations.context.Context;
import dev.rollczi.litecommands.annotations.description.Description;
import dev.rollczi.litecommands.annotations.execute.Execute;
import dev.rollczi.litecommands.annotations.permission.Permission;
import org.bukkit.command.CommandSender;

@Command(name = "sample")
public class SampleCommand {

    @UsageExecute
    void help(@Context CommandSender sender) {
        sender.sendMessage("The command require xxx to execute,");
        sender.sendMessage("Maybe you can use /sample set <value> ?");
    }

    @Execute(name = "sample")
    @Description("Sample command")
    @Permission("sample.permission")
    void sample(@Context CommandSender sender) {
        System.out.println("Sample command");
    }


    @Execute(name = "set")
    @Description("Sample command")
    @Permission("sample.permission")
    void set(@Context CommandSender sender, @Arg Integer someValue) {
        System.out.println("Sample command");
    }
}