[mat-dialog]: Proposal to add type safety for dialog result value

[reppners]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

Type safety for MatDialog result values.

What is the current behavior?

No generic type in the signature of MatDialogRef to support typing the expected return value.
This makes dialog result handling error prone.

What is the use-case or motivation for changing an existing behavior?

Improve type safety by getting rid of any on dialog result values.

Introduce a second generic parameter on MatDialogRef<TComponent, TResult> that enables to be more specific on the type of the dialog result value.

[crisbeto]

This is exactly what #8766 does. Closing as a duplicate of #8760.

[reppners]

Cool! Didn't find it when searching. Thx!

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