Support ["prop"] syntax on class definitions

[JohnnyMorganz]

Some classes have properties which are not valid identifiers (such as https://create.roblox.com/docs/reference/engine/classes/Studio)

This adds support for the following syntax in definition files:

declare class Foo
    ["a property"]: string
end

Closes #702

[ghost]

Surely this could be expanded to work inside Luau as well? Having [x] support in type defs would be insanely useful for non-string types

type ATypeWithSpaces = {
  ["member with spaces"]: string
}

[JohnnyMorganz]

Surely this could be expanded to work inside Luau as well? Having [x] support in type defs would be insanely useful for non-string types

type ATypeWithSpaces = {

  ["member with spaces"]: string

}

I'm pretty sure this already exists (it's what I based this PR off)

[ghost]

Surely this could be expanded to work inside Luau as well? Having [x] support in type defs would be insanely useful for non-string types

type ATypeWithSpaces = {

  ["member with spaces"]: string

}

I'm pretty sure this already exists (it's what I based this PR off)

Must have missed it because yea thats valid lol 👍