Subcommand object not accessible from context in checks added to groups

[sdf9s8d76f]

When adding checks to command groups, it is not possible to get access to the executed subcommand object from the context, which would be required for getting data from it, for example, in a subcommand permission system. Example:
Example code:

import hikari

import tanjun


def check(ctx: tanjun.abc.SlashContext) -> bool:
    print(ctx.command.metadata.get("required_subcommand_permission"))
    return True


group = tanjun.slash_command_group("testgroup", ".")
group.add_check(check)


@group.as_sub_command("test", ".")
async def test_command(ctx: tanjun.abc.SlashContext) -> None:
    await ctx.respond(f"{ctx.command.metadata.get('required_subcommand_permission')}")


test_command.set_metadata("required_subcommand_permission", "some permission")

loader = tanjun.Component().load_from_scope().make_loader()

bot = hikari.impl.GatewayBot("MTE3MjQ5OTUzMDE5Mzg0NjI5Mg.GS629g.jhAkLkkPG9ixAliL_2TW2xYCDiWIFf5i_BXE5Y") # Doesn't exist
client = tanjun.Client.from_gateway_bot(bot, declare_global_commands=True)
client.load_modules("main")

if __name__ == "__main__":
    bot.run()