Add inlay hints to show types

[RobbyCBennett]

Problem(s) this feature will solve

I don't know the types of things until I see the hover text. This is the case in C++ with the dreaded auto keyword.

Describe the solution you'd like

Use inlay hints to display types when they are declared. Maybe this should be implemented with other hints and options to enable each one.

Ideas for inlay hints

• Types of declarations
• Parameter names