ci: add more linting checks

[voxpelli]

As a preparation for a PR that bumps our Node.js requirement (and as somewhat of an extraction from #204) I wanted to do this PR that extends our linting checks in three ways:

1. It checks the formatting as part of the linting
2. It validates that the engines.node doesn't promise more than what our dependencies does (using my installed-check)
3. It adds knip to do all the kinds of checks that knip does. knip will also be used in eslint/eslint: chore: Introduce Knip eslint/eslint#18005

On top of that this PR also updates npm-run-all to the maintained fork (maintained by @bcomnes with occasional assistance by me) + starts using run-p to run all of the lint: jobs in parallel, to gain some speed advantage.

The installed-check script is currently set to installed-check -v -i installed-check -i npm-run-all2 -i knip as all three of those have a tighter engines.node requirement, but since all three of those are only run in linting and we don't need to run linting on older node.js versions, its okay.

The -v on the installed-check script is used to output warnings, and it outputs that currently none of the used versions of opener, rimraf and vitepress are defining an engines.version, making it impossible for installed-check to verify if they are inside or outside of our engines.node.

[voxpelli]

Updated to also include an .editorconfig, to avoid the most basic of formatting inconsistencies. See also eslint-community/eslint-plugin-n#126 (which I copied this config from)

[ota-meshi]

LGTM! Thanks!