Extract and expose postscriptName & fullName from font metrics

[michaeltaranto]

The font metrics returned now include the postscriptName and fullName properties as authored by the font creator.

For example:

// Arial Regular metrics
{
  "familyName": "Arial",
  "fullName": "Arial",
  "postscriptName": "ArialMT",
  ...
}

// Arial Bold metrics
{
  "familyName": "Arial",
  "fullName": "Arial Bold",
  "postscriptName": "Arial-BoldMT",
  ...
}

These values are particularly useful when constructing CSS @font-face declarations, as they can be used to specify local(<font-face-name>) sources.
MDN recommends using both “to assure proper matching across platforms”.

@font-face {
  font-family: "Web Font Fallback";
  src: local('Arial Bold'), local('Arial-BoldMT');
  font-weight: 700;
  ascent-override: 89.3502%;
  descent-override: 23.1683%;
  size-adjust: 108.3377%;
}

[changeset-bot]

🦋 Changeset detected

Latest commit: acf95a7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@capsizecss/metrics	Minor
@capsizecss/unpack	Minor

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