Optimize SVG assets and update builder interface

[joshblack]

Closes #5568

This PR adds in the ability to optimize SVG assets in the output package directory, alongside including QOL fixes for our builder packages.

This PR also adds in tests for the icons-vue package since we ended up needing to update the builder with the new metadata format. A big source of the LOC changes comes from the snapshots generating its public API.

A lot of the diff seems to come git detecting deletions of assets when in realizing the svg folder just moved to src/svg 😅

Changelog

New

• e2e/icons-vue
  • Add PublicAPI tests for icons-vue
• Add official vue builder to icon-build-helpers
• Add svg builder for optimizing SVG assets
• Add new output extension, this extension does the following:
  • Optimizes asset sources
  • Transform asset source to JS descriptor
  • Provides module name

Changed

• svg assets now live in src/svg instead of svg
• icon-build-helpers
  • Metadata now takes in an advanced input option for SVG and extension directories
    • Update e2e tests to use new syntax for input
    • Update sketch task to use new syntax
  • Builders are now simplified with a new metadata structure
    • react builder has been updated
    • vanilla builder has been updated
  • Bugfix for metadata extensions where it was called with an empty object instead of letting default options be applied
• Update all icon/pictogram tasks with new metadata syntax

Removed

• Un-used files from icon-build-helpers package
• Remove old entrypoint test for icons-vue
• Remove unused icons-vue task files

Testing / Reviewing

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