feat: redo CV2 and New Modal implementation

[NeloBlivion]

Summary

• View and Modal now only support original components (Button / Select, InputText) - assume behavior from <=2.6.1
• New components are now used in DesignerView and DesignerModal (names not finalised idk)
• Usage is basically the same as rc1, with some differences
  • DesignerView and Container do not support Button, @button, Select and @select directly; use ActionRow instead.
  • Section still supports Button as accessory and the button decorator
  • DesignerModal does not support InputText and Select directly; use Label instead. TextDisplay still works as a top-level component.
  • InputText.description, Select.label and Select.description are removed as they are part of the Label component
• DesignerView can still be used for v1 messages (supporting content and embeds) if you want to migrate to ActionRow for any reason.
• Attempting to add ActionRow to a View will add the row's children instead
• Item has been split into ViewItem and ModalItem
  • InputText and Label now inherit ModalItem
  • All View-based items now inherit ViewItem
  • Select and TextDisplay inherit both ViewItem and ModalItem (even though Select is not a top-level modal item, i believe it still fits)

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.

[NeloBlivion]

changing this to a general feature pr teehee

[Soheab]

enumerate()?

[Soheab]

No overloads for DesignerView and no content, embeds etc?

Same thing for all the other send methods.

[NeloBlivion]

i probably should but god it's a pain

[Soheab]

Needs to update ext.pages too.