feat(material/slider): Support for multi word thumb label text

### Feature Description

In mat slider thumb label, need a support for multi word text. As we can format thumb label text by using **displayWith** property and add suffix or prefix to the number. We have a use case in which using value from mat-slider, we are creating labels like poor, below average, above average, etc. But in current implementation multi word label text is not supported. Words gets wrapped as we give space in the label text string.

### Use Case

We have used mat slider of range {min=0, max=10, step=01} for taking ratings from user
by using the mat slider value I am creating rating labels such as poor, below average, average, above average and excellent. As per the number I want to show that particular label in thumb label text.

[Stackblitz link](https://stackblitz.com/edit/sxcf47?file=src%2Fapp%2Fslider-formatting-example.html,src%2Fapp%2Fslider-formatting-example.css,src%2Findex.html,src%2Fstyles.scss,src%2Fapp%2Fslider-formatting-example.ts,package.json)

リンクされている StackBlitz の例、特に src/app/slider-formatting-example.html、src/app/slider-formatting-example.css、src/app/slider-formatting-example.ts から始めて、フォーマットされた thumb ラベルを再現します。Angular Material slider thumb-label の実装を追跡し、複数語の displayWith テキストが 1 つのラベル内に収まるようにします。「平均未満」のようなラベルが折り返しなしでレンダリングされれば完了です。

索引モデルが issue の本文から書いたものです。