fix: add exportAs to missing components/directives

[rafaelss95]

To make sure that we don't forget about it, I've added it to the validate-decorators rule.

[rafaelss95]

As the regex I used in validate-decorators#exportAs rule is a little bit strict, I had to disable this rule in 3 places (Dir, Table#RowPlaceholder and Table#HeaderRowPlaceholder). What do you guys think about it?

[crisbeto]

I'm not sure that adding this to absolutely everything make sense. The reason a lot of these components weren't exposed was because it just doesn't provide any value (e.g. for directives like MatCardContent and MatCardTitle).

[rafaelss95]

Got it. In this case, should I close this?

[jelbourn]

@rafaelss95 yeah; like @crisbeto said, it's not something that goes on every directive, instead only being applied when there would be some API you'd need to access for a feature

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