Extract the copied functionality to reusable functions

[NetanelBasal]

No description provided.

[NetanelBasal]

Assign to Dan Roujinsky

[danzrou]

Will create functions as follows:

controlValueChanges$<T>(control: AbstractControl<T>);
controlDisabled$<T>(control: AbstractControl<T>);
controlEnabled$<T>(control: AbstractControl<T>);
controlStatusChanges$<T>(control: AbstractControl<T>);
enableControl<T>(control: AbstractControl<T>, enabled: boolean, opts?: ControlOptions);
disableControl<T>(control: AbstractControl<T>, disabled: boolean, opts?: ControlOptions);
disableWhile<T>(control: AbstractControl<T>, observable: Observable<boolean>, opts?: ControlOptions);
enableWhile<T>(control: AbstractControl<T>, observable: Observable<boolean>, opts?: ControlOptions);
mergeValidators<T>(control: AbstractControl<T>, validators: ValidatorFn<T[]> | ValidatorFn<T[]>[]);
validateOn<T>(control: AbstractControl<T>, validation: Observable<null | object>);
hasErrorAndTouched<T>(control: AbstractControl<T>, error: string, ...path: any)
hasErrorAndDirty<T>(control: AbstractControl<T>, error: string, ...path: any)
markAllDirty<T>(formArray: FormArray<T>);