Make it more practical for an API to have type, module and/or union case with the same name

Make it fully practical to use an API that has a type, module and union cases with the same name without opening that module.

Consider this:

```fsharp
module Domain
type TodoID = TodoID of int
module TodoID = let value (TodoID i) = i
```

In this situation it is currently not possible to reference the module from a different source file using a fully qualified name.
For example, try to reference it from a different file using a fully qualified name:

```
module DTO_broken
let ti = Domain.TodoID 1
let i1 = Domain.TodoID.value ti // error FS0039: The field, constructor or member 'value' is not defined.
let i2 = Domain.TodoIDModule.value ti // error FS0039: The value, constructor, namespace or type 'TodoIDModule' is not defined
```

Code does not compile.

Relevant dotnet/fsharp issues

* https://github.com/dotnet/fsharp/issues/9807#issuecomment-679239494
* https://github.com/dotnet/fsharp/issues/8424
* https://github.com/dotnet/fsharp/issues/13122

Start with the Domain/TodoID reproducer and the fully qualified references in DTO_broken to understand the current compiler failure. Read the three linked dotnet/fsharp issues for prior discussion; done means the example compiles and Domain.TodoID.value is usable from another source file without opening the module.

Written by the indexing model from the issue text.