feature(MatTooltip): Possibility to define current tooltip position

[IrisWight]

Use Case

When the element with tooltip reaches the viewport border, the tooltip automatically changes its position from the one that was originally set in matTooltipPosition input. In case when we add arrow to the tooltip we can’t change the position of it.

Screenshots:

Code: https://stackblitz.com/edit/angular-bgbato
Please add possibility to define current tooltip position so we can link the arrow to it or we’ll appreciate any help with this matter.

[crisbeto]

Closing as a duplicate of #15216.

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