Make application commands register on login

[Hype3808]

Summary

Make application commands register on login instead of on_connect event so you don't have to manually register the slash commands when u call a on_connect.

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, ...)

Extra Checklist

• No errors have been raised when starting the bot

Confirmations

• I have checked the open PRs and no PR exists like this one.
• My PR focuses on only one issue/change.

[VincentRPS]

lgtm, but if this is on_connect why not put it in connect?

[Hype3808]

lgtm, but if this is on_connect why not put it in connect?

There is too much stuffs in connect method. It will be better to put it in login as we want application commands to register when logging in.

[izxxr]

On second thought, there should be a separate function to do this that get's called in start()

[Hype3808]

On second thought, there should be a separate function to do this that get's called in start()

Do you mean that changing it from login to start?