refactor(ivy): remove LNode

[kara]

This PR removes the LNode object. We used to create an LNode object for every single DOM element.

So if you had an ngFor with 10,000 items like below, you'd get 10,000 LNode objects and 1 TNode

<div *ngFor="let row of rows"></div>

With this PR, the same template will only produce 1 TNode and 0 LNodes.

[mary-poppins]

You can preview 1592ca4 at https://pr26426-1592ca4.ngbuilds.io/.

[kara]

presubmit

[mary-poppins]

You can preview 9784362 at https://pr26426-9784362.ngbuilds.io/.

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