Add tech() function support (in @font-face src)

[Schweinepriester]

• Spec: https://www.w3.org/TR/css-fonts-4/#font-tech-definitions
• Chrome:
  • Intend to ship: https://groups.google.com/a/chromium.org/g/blink-dev/c/_9k-Ne8FRu4/m/Y5t_T50pAgAJ
  • https://chromestatus.com/feature/5088679224147968
  • Shipping in Chrome 107
• Firefox:
  • https://github.com/mozilla/standards-positions/issues/563
  • https://bugzilla.mozilla.org/show_bug.cgi?id=1715546
  • Seemingly shipping in Firefox 105

Example from the spec:

@font-face {
    font-family: "Trickster";
    src: url("trickster-COLRv1.otf") format(opentype) tech(color-COLRv1), /* ← here */
         url("trickster-outline.otf") format(opentype);
}