feat(table): MatCellHarness should extend ContentContainerComponentHarness

[JoepKockelkorn]

Feature Description

MatCellHarness should extend from ContentContainerComponentHarness instead of ComponentHarness so it exposes (at least) the getHarness and getAllHarnesses methods to scope the loading of harnesses.

Use Case

Quite often it is the case that a table cell has more than just text content (like a custom icon component). It would be nice if the MatCellHarness would expose the methods of ContentContainerComponentHarness to load harnesses within the table cell. From the docs I can see that ContentContainerComponentHarness is meant for components that have a ng-content slot, and in a way a table cell is exactly that.

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