feat(MatDIalog): Allow specifying MatDialogConfig as part of the dialog component

### Feature Description

Currently if there is a dialog which is meant to be used with a specific width, height, autoFocus, disableClose, etc... each and every code that opens that dialog need to specify those values. Even if extracted to a const you still need to remember to pass it.

What I wish to have is the ability to specify on the dialog component itself those configuration options or at least some of them that make sense. Allowing to actually "declare" to the one using - If you pass nothing in the `open` function config - this is the recommended and default config for this specific dialog. If you do pass a config object it overrides the recommended one.

### Use Case

When having a dialog that needs for example to have `autoFocus` as false always as it handles it inside - everyone using that dialog has to remember to declare this specific config when opening otherwise the dialog won't work as expected. Even if it was extracted to a const - the one opening the dialog still needs to know that const exists and remember to pass it.
The suggestion allows the dialog creator to specify the default config.

Inizia esaminando le API di MatDialog e MatDialogConfig e la discussione esistente sull'issue. Definisci come un componente di dialogo dichiarerebbe la configurazione predefinita e come i valori forniti a open la sovrascriverebbero; il lavoro è completato quando il comportamento richiesto di default-config è specificato e coperto da test appropriati.

Scritto dal modello di indicizzazione a partire dal testo della issue.