Support dict with combination of positional arguments, keyword arguments and **args

This is a follow-up to #239.

Is this about the following?

    a = dict(x=1, y=2)
    b = dict(a, z=3)

The first works but the second gets:

...: error: No overload variant of "dict" matches argument types [Any, builtins.int]

I have three live occurrences of this.

Yeah, that as well. I was thinking about dict(x=1, **d).

Oh, the latter is probably less common?

Our code has a bunch of instances of the b = dict(a, z=3) kind of constructor, using it to copy dicts with some specific values changed.

The discussion at #1370 (comment) is relevant.

Hack to type check keyword arguments to dict() better

Sync typeshed

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