[IgxForOfDirective] use generic types

[pmoleri]

Is your feature request related to a problem? Please describe.

When using igxForOf my items are inferred as type any.

e.g. <div *igxFor="let item of [1,2,3]"></div>

Describe the solution you'd like

I'd like the directive to take advantage of generics to get proper types in my items.

Describe alternatives you've considered

None

[pmoleri]

The trick is adding a declaration like this (copied from ngFor):

export class IgxForOfDirective<T, U extends NgIterable<T> = NgIterable<T>> {
    ...
    
    /**
     * Asserts the correct type of the context for the template that `igxForOf` will render.
     *
     * The presence of this method is a signal to the Ivy template type-check compiler that the
     * `IgxForOf` structural directive renders its template with a specific context type.
     */
    static ngTemplateContextGuard<T, U extends NgIterable<T>>(dir: IgxForOfDirective<T, U>, ctx: any): ctx is IgxForOfContext<T> {
        return true;
    }

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