fix(commands): fix permission check edge case

[Middledot]

Summary

Fixes #2113

Inviting a bot to a server with only the applications.commands scope results in permission checks giving AttributeError because it can't crosscheck permissions of channel and user to the default role of the server (interaction gives a partial guild object).

I decided to fix this by assuming the default role has no permissions (so permission checks always fail)

I also made it so that a guild object is created and accessible from interaction.guild but not added to the cache. I was thinking it shouldn't be added to state because this is a weird edge case that pycord v2 doesn't support, and the guild only has "locale", "id", and "features" (which is an empty list).

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.
• I have updated the changelog to include these changes.