Infrastructure maintenance

[plouc]

• Migrate to pnpm.
• Upgrade rollup.
• Remove UMD builds as I could never get them to work properly, and they don't seem to be used.
• Fix dependencies, as pnpm is stricter regarding deps, I realized several ones were missing, also related:
  • Change devDependency to dependency #1941
  • 0.79 regression: Yarn 3 berry errors with @nivo/legends dependencies (d3-scale and @nivo/colors) #1951
  • Peer dependency chain break when using yarn PnP #2014
• Isolate stories in a separate folder/project.
  While being able to run storybook without the need to compile the packages was nice, it was a pain to get it to work with rollup, and we ended up having 2 ways to compile the packages. Also all storybook dependencies were at the root, it's saner/simpler this way IMHO. It'll also allow us to upgrade things independently.
• Upgrade storybook and migrate all existing stories to the new format.
• Force the use of React 18 within the repo, the packages constraints still support older versions.
  There's still some work to do to properly support React 18, but at least we can experience the issues 😅
• Upgrade TypeScript: 4.5.4 -> 4.9.5 and fix typing issues.
• Adjust jest transformIgnorePatterns to work with pnpm: https://jestjs.io/docs/configuration#transformignorepatterns-arraystring (due to some D3 packages being esm only).
• Make targets for packages were all renamed to pkg|pkgs.
• Upgrade eslint.
• Upgrade prettier.
• The use of enzyme is problematic with React 18 as it's not supported, we'll need to figure out a strategy for testing, tests still work, but with a bunch of warnings.

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