fix(material-experimental/mdc-table): add background color; disable hover styles; fix sticky columns

[andrewseguin]

The MDC-based table does not handle sticky columns. Cells overlap their text since they do not have a background color. Fixed by adding a background color to the table like we do with the legacy table, and inheriting the background down through the component.

Hover styles have been disabled. They break this fix since they include opacity, introducing the same issue. MDC should change their default hover color to be a solid color rather than one with an alpha channel.

[crisbeto]

Instead of having these inherit the background, would it make sense to just assign the background to the cells in the theme? This feels like something that we could forget about if we remove the background from the theme.

[andrewseguin]

Do you mean assign the card background to the cells? The benefit with the inherit approach is that users can style the table host element with a background and it works as expected, rather than identifying that they need to style the cell background.

[crisbeto]

Alright, makes sense. Let's keep it like this.

[wagnermaciel]

lgtm

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