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)

首先阅读 mat-select 现有的 panelWidth 处理方式，以及 issue 中描述的 trigger-width 和 largest-option 行为。定义并实现一个 API 或 option，使 panel 至少与 trigger 一样宽，同时允许其扩展到最大 option 的宽度，然后验证对于更宽和更窄的 option 的行为。

由索引模型根据 Issue 内容生成。