refactor(material/form-field): allow AbstractControlDirective as MatFormFieldControl.ngControl

[crisbeto]

Allows for an AbstractControlDirective to be passed in as the MatFormFieldControl.ngControl. The advantage of passing in the abstract control directive is that it allows both form controls and form groups. This is necessary for the date range picker.

[mmalerba]

Looks like there's some build error

[crisbeto]

The build error should be resolved now. I forgot to update the MDC text field.

[jelbourn]

@crisbeto this looks like a breaking change. ngControl is a public API, and so we start to see errors like

error TS2322: Type 'AbstractControlDirective | null' is not assignable to type 'NgControl | null | undefined'.
  Type 'AbstractControlDirective' is missing the following properties from type 'NgControl': name, valueAccessor, validator, asyncValidator, viewToModelUpdate

22     this.field = formControl.ngControl;

[crisbeto]

@jelbourn I've changed the type to be less break-ey. Can we do another run?

[mmalerba]

I suspect that its just going to complain that AbstractControlDirective | NgControl | null is not assignable to NgControl | null | undefined now

[jelbourn]

Yep

error TS2322: Type 'NgControl | AbstractControlDirective | null' is not assignable to type 'NgControl | null | undefined'.
  Type 'AbstractControlDirective' is missing the following properties from type 'NgControl': name, valueAccessor, validator, asyncValidator, viewToModelUpdate

22     this.field = formControl.ngControl;
       ~~~~~~~~~~

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