IgxForOf directive does not support `as` syntax in template for bound data

[skrustev]

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

When the igxForOf is used, if the data provided is somehow transformed for example as per discussed here #13190:

<div *igxFor="let item of data | slice">...</div>

The result of the pipe cannot be assigned in the template to a variable the following way similar to ngFor:

<div *igxFor="let item of data | slice" as slicedData>...</div>

Describe the solution you'd like

as syntax should be available in the igxFor template.

Describe alternatives you've considered

Other alternatives are getting the igxForOf input value in code and then using it in the template