feat: Notion Styled Toggle List

[remusris]

Describe the feature you'd like to request

If we can add in a custom block type that mirrors the "toggle" functionality of notion that would be amazing.

Describe the solution you'd like to see

There's an arrow that toggles nested text inside that node. The head text should be able to work with any type of header type.

Additional information

Basically inside the subnode it should function like a "micro" document, its own separate document.