Changes

• Migrate from Yarn & Lerna to PNPM
• Use Storybook v7 (beta). It works with PNPM! But the stories should be re-written into Component Story Format 3.0. I only tested it on SAlert component so far.
• Use TypeScript 5 (release candidate). It highlighted some new errors...
• Tried to use much stricter TypeScript configuration, but we have 100+ errors with it! I left it for an upcoming PR.
• Update ESLint rules. I had to disable some of them, and I think it should be fixed in an upcoming PR.
• Remove Jest, use Vitest everywhere
• Remove API Extractor. Use rollup-plugin-dts for .d.ts bundle
• Set packages' type to module
• Update a lot of packages
• Use ^x.y in prod dependencies for better (?) deps resolution experience of library users
• etc etc

This PR leaves a lot of TODOs and FIXMEs, and I think those should be fixed separately. Also I think it makes sense to release new versions with a pre-release tag, because there might be unexpected regressions.

To-Do

Issues to be resolved after the merge:

• Enable strict TypeScript options #512
  • [refactor] #512: use stricter tsconfig #518
• Enable temporarily disabled ESLint rules #513
  • [refactor] #513: enable ESLint a11y rules back #529
• Refactor stories to CSF 3.0 #514
  • [refactor] #514: Component Story Format 3.0 #520
• Restore component names setting #515
  • [fix] #515: infer SFC names #523

Fixes #423