fix: add extension name before loading in callbacks

[AstreaTSS]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

This one's on me - I probably should have done more testing.

Anyways, while making #1678, I did not account for, when adding prefixed commands in extensions, that the extension's extension_name does not exist yet. This variable is used when registering prefixed commands, and so an error appears:

Traceback (most recent call last):
  File "/home/astrea/Documents/dis-snek-testing-ground/interactions-py-library/interactions/client/client.py", line 1995, in __load_module
    setup(self, **load_kwargs)
  File "/home/astrea/Documents/dis-snek-testing-ground/bot/ipy5ext.py", line 10, in setup
    AExt(bot)
  File "/home/astrea/Documents/dis-snek-testing-ground/interactions-py-library/interactions/models/internal/extension.py", line 109, in __new__
    bot.add_command(val)
  File "/home/astrea/Documents/dis-snek-testing-ground/interactions-py-library/interactions/client/client.py", line 1422, in add_command
    hook(func)
  File "/home/astrea/Documents/dis-snek-testing-ground/interactions-py-library/interactions/ext/prefixed_commands/manager.py", line 237, in _register_command
    self.add_command(callback)
  File "/home/astrea/Documents/dis-snek-testing-ground/interactions-py-library/interactions/ext/prefixed_commands/manager.py", line 138, in add_command
    self._ext_command_list[command.extension.extension_name].add(command.name)
AttributeError: 'AExt' object has no attribute 'extension_name'. Did you mean: 'extension_error'?

I... don't know how prefixed command registering before #1678 worked, since the old version still should register prefixed commands before extension_name exists, but async funkiness, I suppose. Regardless, this PR fixes extension_name not existing by adding it in earlier.

Changes

• Move extension_name assignment to before adding callbacks, instead of after.

Related Issues

Test Scenarios

import interactions as ipy
from interactions.ext.prefixed_commands import prefixed_command, PrefixedContext


class AExt(ipy.Extension):
    @prefixed_command()
    async def test2(self, ctx: PrefixedContext):
        await ctx.send("Woo!")


def setup(bot):
    AExt(bot)

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable

[silasary]

Seems reasonable