Option for generating member function instead of lambda-getter-setter

[davedawkins]

I have a PR for this ready

The API I'm working with (Appwrite) has many member functions which are currently being generated as property getter/setters. It works, but doesn't (usefully) capture the optional arguments.

For example

declare class Api {
    account: {
        users: (name : string, loggedIn? : boolean | undefined) => string[];
    };
}
export { Api };

Current output:

type [<AllowNullLiteral>] ApiAccount =
    abstract users: (string -> (bool) option -> string[]) with get, set

Preferred output:

type [<AllowNullLiteral>] ApiAccount =
    abstract users: name: string * ?loggedIn: bool -> string[]

With the second form, I'm able to call the API as users.name("Joe"). I don't get the correct behaviour if I use the first form as users.name "Joe" None

[davedawkins]

Incoming PR implements this: