Added an example project Akka.Hosting.CustomJournalIdDemo.FSharp

[ingted]

Fixes #

With F# class explicit interface implemented situation, (This is part of the Akka.Hosting demo project, and I port it into F#)

    [<Interface>] 
    type IWithUserId =
        abstract member UserId : string

    type UserDescriptor(UserId:string, UserName:string) =
        interface IWithUserId with
            member this.UserId = this.UserId //line1
        member this.UserId = UserId  //line2
    
        member this.UserName = UserName

If I don't add line2, then UserId of the deserialized object will be null...

Changes

Added an example project Akka.Hosting.CustomJournalIdDemo.FSharp. And bug fixed.

Checklist

For significant changes, please ensure that the following have been completed (delete if not relevant):

• [ o] This change follows the Akka.NET API Compatibility Guidelines.
• [ o] This change follows the Akka.NET Wire Compatibility Guidelines.
• [ o] I have reviewed my own pull request.
• Design discussion issue #
• Changes in public API reviewed, if any.
• I have added website documentation for this feature.

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[ingted]

I didn't change build.cmd... Don't know why it failed ...

[Aaronontheweb]

@ingted we'll see what GitHub Actions reports back on the PR and maybe I can help troubleshoot

[Aaronontheweb]

LGTM!