ext.bridge improvements

[Middledot]

Summary

Makes a bunch of changes to ext.bridge

• Implements bridge command groups
  • bridge.map_to decorator to use main command as subcommand
• Attachment option
• is_app property added to better differentiate context types

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting, examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.

[Lulalaby]

@Dorukyum

[Dorukyum]

Could we add an example?

[Dorukyum]

I get the following error on startup now:

Traceback (most recent call last):
  File "test.py", line 9, in <module>
    async def hello(ctx: bridge.BridgeContext):
  File "discord/ext/bridge/bot.py", line 88, in decorator
    result = bridge_group(**kwargs)(func)
  File "discord/ext/bridge/core.py", line 318, in decorator
    return BridgeCommandGroup(callback, **kwargs)
  File "discord/ext/bridge/core.py", line 262, in __init__
    self.slash_variant: BridgeSlashGroup = BridgeSlashGroup(self.ext_variant.name, *args, **kwargs)
  File "discord/ext/bridge/core.py", line 64, in __init__
    super().__init__(func, **kwargs)
  File "discord/commands/core.py", line 625, in __init__
    raise TypeError("Callback must be a coroutine.")
TypeError: Callback must be a coroutine.

The code I used:

bot = bridge.Bot(command_prefix="t.", intents=Intents.all())

@bot.bridge_group(description="Test command")
async def hello(ctx: bridge.BridgeContext):
    ...

@hello.command()
async def there(ctx: bridge.BridgeContext, attachment: Attachment):
    await ctx.respond(attachment.filename)

[Middledot]

Should be fixed and an example was added.

Resolved

[Dorukyum]

Hopefully the last review for this pr 😅

[Dorukyum]

Good job