embedded-typst 0.1.0

Added

• Fonts and FontsBuilder: Typst's bundled fonts, in-memory fonts, system fonts and font paths,
  loaded from disk on first use.
• EmbeddedWorld: in-memory files, ordered root directories, sys.inputs, a fixed creation
  timestamp and dependencies().
• Packages (packages feature) with Typst Universe downloads (download feature).
• Extracted from typstgen's world.