Support Inline Hints

[cartermp]

Implementing this API: https://github.com/dotnet/roslyn/tree/master/src/Tools/ExternalAccess/FSharp/InlineHints

Checking things like:

• Inferred types on bindings
• Parameter name hints

[cartermp]

It's actually very possible and works very well: #10295

The remaining work is to wire up roslyn-based options into this.

[cartermp]

I'm going to push this out to dev17.