Implement modals

[thesadru]

References

• official notion post
• API documentation
• current partial implementation in disnake
• discord-payloads
• Disnake Beta Tests
• @Victorsitou helping with the details

Checklist

ETA: 9 months ago

• Make all pipelines pass
• modal interaction response (sent to user)
  • builder
  • rest method
• modal interaction event (gotten from user)
  • all attributes
  • all helper methods
  • respond with rest
  • respond with restbot
• text input
  • interaction model
  • response builder
    • builder classes
    • helper methods
• factory
  • modal
  • text input
• tests
  • modal interaction response
    • rest
    • helper methods
  • modal interaction response builder
    • rest
    • helper methods
  • modal interaction event
    • entity factory
    • methods
  • text input builder
• suggestions
  • helper method to add a single text input wrapped in an action row

Closes #1329

[Jonxslays]

<3 sadru.

[hypergonial]

Been testing it for about a week now, seems ready for final review.

[ghost]

An issue with adding create_modal_response to MessageResponseMixin - you cannot respond to a modal with another modal so this gives incorrect suggestions for IDE autocomplete.

[FasterSpeeding]

If ya could get some of ye last review thingies fixed i'da think this would be bout ready to merge

[yakMM]

Thanks, this works nicely for users and should be good for future evolution!