Interaction class context, is_guild_integration and is_user_integration

[Vioshim]

Summary

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• 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, ...)

[Rapptz]

I would prefer the typing changes to not be there for the internal methods, since the ones I put were more correct but that's fine.