feat(button): add support for filled tonal button same as in M3 spec

[eneajaho]

Feature Description

https://m3.material.io/components/buttons/guidelines#07a1577b-aaf5-4824-a698-03526421058b

Use Case

No response

[bradleybeighton]

+1

[vulture9]

upvoted missing core feature should be implemented.

[MariusMoeOlsen]

Yes, I also need this.

[nasser-alkhateeb]

+1. This feature should be implemented. In the meantime, we can use the following:

button.mat-tonal-button {
  background-color: var(--sys-secondary-container);
  color: var(--mat-app-on-secondary-container);
}

<button class="mat-tonal-button" mat-button>
</button>