Optional typing of MatSelectChange

[Wilt]

This event should be typed. Added type and fallback to any to make this optional and backwards compatible.

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[mmalerba]

@Wilt seems reasonable to me, can you sign the CLA? thanks!

[Wilt]

@mmalerba I think I finally managed to get this CLA check to pass.

[Wilt]

If this is viable for merging could you then also please merge similar optional typing solution for MatRadioChange event.
See another PR for that here: #30477

[mmalerba]

The changes were merged into the following branches: main, 19.1.x, 19.2.x

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