feat: implement Figma icon import CLI

[larsrickert]

Relates to #939

Implement Figma CLI command to import and optimize SVG icons from Figma.
Also added a GitHub action which is run daily to create a PR with updated icons.

Checklist

• The added / edited code has been documented with JSDoc
• A changeset is added with npx changeset add if your changes should be released as npm package (because they affect the library usage)

[changeset-bot]

🦋 Changeset detected

Latest commit: 56a5275

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

This PR includes changesets to release 9 packages

Name	Type
@sit-onyx/figma-utils	Minor
@sit-onyx/icons	Major
demo-app	Patch
playground	Patch
sit-onyx	Major
@sit-onyx/storybook-utils	Major
@sit-onyx/chartjs-plugin	Major
@sit-onyx/nuxt	Major
@sit-onyx/vitepress-theme	Major

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[larsrickert]

Notes before my vacation:

• you can already review this PR it if you'd like
• I discussed with Martin that we will align a date together with the responsible UX collegues who will maintain the icons in the future. Starting from this date, we will sync/update the latest icons once and then handle the Figma file as single source of truth. Also CoreUI will need to be updated then to use the onyx icon library.
• missing feature of Implement icon from figma downloading cli tool #939: create a changeset in the pipeline and ideally include a list of added/changed/removed icons (we could amybe use git CLI for this)

[BoppLi]

Also CoreUI will need to be updated then to use the onyx icon library.

afaik STACKIT is also a consumer of the current icon lib repo that Lily maintains. maybe put it on the ticket to inform them about the change of procedure aswell? if it isn't already in the backlog

[larsrickert]

Also CoreUI will need to be updated then to use the onyx icon library.

afaik STACKIT is also a consumer of the current icon lib repo that Lily maintains. maybe put it on the ticket to inform them about the change of procedure aswell? if it isn't already in the backlog

I am in contact with Lilia and Frank on this :)

Approved by @maja