feat(docs): show additional type aliases in docs.

[devversion]

• Shows type aliases that belong to specific components in the documentation (e.g. MatSnackBarHorizontalPosition)

Closes #10468

[jelbourn]

Can you share a screenshot of what it would look like in the docs?

[devversion]

It looks like that:

That's just the generated HTML inserted into the docs.

Additional styling (like making the type bold) can be still made afterwards in the docs. For now it was just important to output the type definitions for some components.

Let me know if you have any ideas on how to improve it -- I considered splitting the types and showing them as an <li>, but that involves too much work to re-parse the AST.

[jelbourn]

LGTM, that works for me

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