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)

Start by reading mat-select's existing panelWidth handling and the trigger-width and largest-option behaviors described in the issue. Define and implement an API or option that keeps the panel at least as wide as the trigger while allowing it to grow to the largest option, then verify the behavior for both wider and narrower options.

Written by the indexing model from the issue text.