fix(table): move padding from rows to cells

[andrewseguin]

Moves the material table's row padding to the first and last cells. This matches native tables which do not support row padding.

BREAKING CHANGES:

• The mat-table has moved its row padding to be on the first and last cells. This matches native tables which do not support row padding.

[vartan]

setting display:flex broke text-align in my existing UIs, what is the justification of setting display:flex on a cell?

[andrewseguin]

@vartan This change is required so that cells can set a min-height, which will be necessary when we want to add the sticky-columns feature.

To resolve your issue, switch text-align: right to justify-content: flex-end. Here's a quick example of this: https://stackblitz.com/edit/js-hpqpt9?file=index.html

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