Adapt generated code to be erase methods which are subset of others

[MangelMaxime]

TypeScript documentation:

export class Logger {
    log(value : string, prefix? : string): void
    log(value : string, prefix? : string, time? : Boolean): void
}

translates into

module rec Glutinum

open Fable.Core
open System

[<Erase>]
type Exports =
    interface end

[<AllowNullLiteral>]
type Logger =
    abstract member log: value: string * ?prefix: string -> unit
    abstract member log: value: string * ?prefix: string * ?time: bool -> unit

However this is causing issues when trying to consume the API from F#.

let logger = unbox<Logger> null

logger.log("Hello, world!")

In the past, I know that when doing #29 some unwrapping of union type arguments I add to remove or add others version of the method to have access to the full API and make F# happy.

For the example, used in this issue we should in theory be able to remove the method which is subset of the other one:

[<AllowNullLiteral>]
type Logger =
-     abstract member log: value: string * ?prefix: string -> unit
    abstract member log: value: string * ?prefix: string * ?time: bool -> unit

Example of npm package using this features: