Apply cog_check method to ApplicationCommand invocations

[NeloBlivion]

Summary

Essentially copies over the cog_check implementation from ext.commands to allow it to run when an application command is invoked.
There was a large PR #640 that would work on a larger scale some months ago, however it was closed due to permission changes. This code addition is relatively minor and as such hopefully shouldn't conflict with any other plans.

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.

[baronkobama]

LGTM