[core] Add eslint rule to restrict import from ../internals root

[JCQuintas]

Following the discussion in #13562 where valid points were raised regarding folder structure and our own conventions, it made more sense to address the actual issue in the charts codebase, where the ../internals root is sometimes automatically imported by the IDE, which has a high probability of causing cyclic imports.

All packages?

This rule be updated to prevent this issue for all packages if needed.
Main issues when using on all our packages.

"/mui-x/packages/x-data-grid/src/components/cell/GridCell.tsx"
  10:39  error  Unexpected path "../../internals" imported in restricted zone  import/no-restricted-paths

"/mui-x/packages/x-date-pickers/src/DateTimePicker/DateTimePickerToolbar.tsx"
  23:39  error  Unexpected path "../internals" imported in restricted zone  import/no-restricted-paths

"/mui-x/packages/x-date-pickers/src/DesktopDateTimePicker/DesktopDateTimePicker.tsx"
  37:8  error  Unexpected path "../internals" imported in restricted zone  import/no-restricted-paths

"/mui-x/packages/x-date-pickers/src/DesktopDateTimePicker/DesktopDateTimePickerLayout.tsx"
  14:44  error  Unexpected path "../internals" imported in restricted zone  import/no-restricted-paths

[mui-bot]

Deploy preview: https://deploy-preview-13633--material-ui-x.netlify.app/

Generated by 🚫 dangerJS against 9dfaa6a

[alexfauquette]

Good for charts. I let others say if they want the rule applied to their packages too

[flaviendelangle]

100% in favor of doing it for the Tree View and the Pickers

[LukasTy]

Nice change. 💯
I think that it would be a nice improvement to other packages as well. 👍

[JCQuintas]

@LukasTy @flaviendelangle added the treeview and pickers packages as well, let me know if the adapted code is correct 😅