feat(mat-select): add smart panel width based on trigger and largest option size

### Feature Description

Currently `panelWidth` can be one of three:
1. Trigger width
2. Largest option width
3. Custom provided width in numbers

What I am missing is - minimum width as trigger width and grow until max option size (if needed)

### Use Case

When having dynamic options texts sometimes they might be larger than trigger width and I want the largest option behavior.
Sometimes they are smaller than trigger width and I want the trigger width behavior to avoid really small select panels.
Which means I actually need: min panel width = trigger width with potential grow (not shrink!) to the largest option width.

Can be with a new `panelWidth` option or even `minPanelWidth` input (can have a complimenting `maxPanelWidth` too for completeness)

Inizia leggendo la gestione esistente di panelWidth in mat-select e i comportamenti trigger-width e largest-option descritti nell’issue. Definisci e implementa un’API o un’opzione che mantenga il pannello largo almeno quanto il trigger, consentendogli al contempo di espandersi fino alla larghezza dell’opzione più grande, quindi verifica il comportamento sia per le opzioni più larghe sia per quelle più strette.

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