no-duplicate-spread-property: only use properties matching contextual type if available

[ajafff]

Since microsoft/TypeScript#26798 there are no longer excess property errors for object spread.

declare let foo: {a: string, b: string};
let bar: {a: string} = {...foo, a: ''}; // error because the only meaningful property `a` of `...foo` is overridden, even if `c` is not overridden

With additional error reporting on spread without meaningful properties this could be used to implement #398

[ajafff]

From #447:

function test<T extends {foo: number}>(t: T) {
  let t2: {foo: number} = {...t, foo: 1}; // could be an error if #399 is implemented
}