IgniteUI / igniteui-webcomponents / 31511094893

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refactor: import internals, theming and animations via subpath aliases (#2322)

Replace ~1000 depth-dependent relative specifiers with the Node subpath
imports `#internals/*`, `#theming/*` and `#animations/*`, declared in the
`imports` field of package.json and scripts/_package.json. These are plain
ESM: tsc emits them verbatim, so no bundling or rewrite step is involved and
consumers resolve them from the package's own manifest.

Components keep importing each other relatively — an alias there would be
longer, no more stable, and would hide the internals -> components layering
inversions.

- add scripts/check-import-aliases.mjs to npm run check, so the dev and
  published maps cannot drift apart unnoticed
- add three dependency-cruiser rules rejecting relative imports into the
  aliased directories
- teach cem.config.mjs to resolve `#` specifiers: the analyzer feeds raw
  specifiers to new URL(), where a leading `#` parses as a fragment and
  collapses mixin, superclass and re-export references onto the importing
  module. custom-elements.json is byte-identical to before the conversion.
- refresh the import guidelines, including ../common/* paths left stale by
  efa9c0a4

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