🪟 🔧 Update eslint and add dependencies explicitly

[timroes]

What

This PR is in preparation to switch us to pnpm. It does the following three things:

• Adding all dependencies we're using explicitly to package.json instead of relying on them being pulled in by other packages.
• This came with an update to the import/order rule, which sorts relative imports slightly differently now. Thus I wanted to pull this into a separate PR, since I --fixed all files in validation of this.
• Due to the new dependencies installed, npm (un)flattens packages in a way that a prior typing conflict is now resolved, thus removed two @ts-expect-error statements. (Makes the point perfectly why we should switch to pnpm :D)

Only the package.json was touched manually, the rest is all just auto fixed by ESLint.

[josephkmh]

Did a quick scan of the eslint fixes and it all looks fine 🙂

[letiescanciano]

Thanks for taking care of this!