Missing Language Server Features (autocomplete & inlay hints)

There are a lot of things that are working, so this is a really great extension! But I noticed some helpful features are still missing.

# Autocomplete on imports

It would be really nice if we could autocomplete imports from mypy!

## mypy

## pylance

# Autocomplete on objects

This may be relayed to the previous, but also getting autocompletes on objects as well

## mypy

## pylance

# Inlay hints

Inlay hint support would be really great too 🥲

## mypy

(notice no inlay hints)

## pylance

# String interpolation shows wrong type

And this was a subtle issue I noticed, it shows the wrong type when hovering over a variable used in string interpolation.

* `(variable) foo: int` is from PyLance
* and `mypy: str` is from MyPy.

`foo` is an `int`, so it should show `int`. It appares mypy is showing the coerced type of the variable.