feat(material-theme): Add “match color tones” option to generator

### Feature Description

`ng generate @angular/material:theme-color` should expose the Material Theme Builder’s “Match color” / color fidelity toggle so that generated palettes can stay faithful to the input colors. This toggle is part of the official Material guidance “Use color fidelity” in https://m3.material.io/styles/color/advanced/adjust-existing-colors#cb49eeb4-3bbd-4521-9612-0856c27f91ef, yet the Angular schematic doesn’t offer an equivalent flag today.

### Use Case

Brand-driven teams rely on exact CI tones, so palette generation has to produce identical output whether we use the Theme Builder UI or the Angular CLI schematic. On https://material-foundation.github.io/material-theme-builder/ the toggle is explicitly labeled “Color match”, and it becomes obvious there how essential the option is: without it, your reference HEX values are brightened or dulled, which immediately violates any strict corporate color guide. Bringing the same “color match”/color-fidelity toggle to `ng generate @angular/material:theme-color` would prevent these shifts, eliminate manual corrections, and keep Angular projects in line with the officially documented Material workflow.

Inizia dal punto di ingresso dello schematic `theme-color` di Angular Material utilizzato da `ng generate`; segui come sono definite le relative opzioni della palette e come vengono passati i colori generati. Aggiungi il toggle di corrispondenza o fedeltà del colore, quindi verifica che le palette generate conservino i colori di input quando è abilitato e mantengano il comportamento esistente quando non lo è.

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