Implement an Elm TypeProvider

Implement a TypeProvider that generates Morphir IR from Elm code, as well as generates F# from Elm.

For example:

```F#
type MyModule = ElmTypeProvider<"""
module MyModule exposing (...)

greet:String -> String
greet target = String.concat ["Hello, " target]
""">
```

Would allow this:

```F#
MyModule.greet "Bob" |> printfn
```