Replace eslint-plugin-import with eslint-plugin-import-x

[fregante]

This might be ideal from a dependency count standpoint, or actually required to enable:

• Upgrade to ESLint 9 #757
• Move to flat config #702
  • Blocked by [New] add support for Flat Config import-js/eslint-plugin-import#3018

This is similar to the work done to switch from eslint-plugin-node to eslint-plugin-n:

• feat!: switch to eslint-plugin-node's maintained fork #660

Some info regarding the switch

• https://x.com/karlhorky/status/1792500813320864023
• https://gist.github.com/karlhorky/b78fdf61c9d284986177daa04430a9a0

The package itself

• https://github.com/un-ts/eslint-plugin-import-x

The work of art

In purple, the dependencies of eslint-plugin-import