cem(typedef): introduce `@import` feature

[Galimede]

Currently we're using the @typedef jsDoc tag, example:

/**
* @typedef {import('./cc-kv-explorer.types.d.ts').CcKvExplorerStateLoaded} CcKvExplorerStateLoaded
*/

But with the release of typescript 5.5.4, we could now use the @import annotation like so:

/**
* @import { CcKvExplorerStateLoaded } from './cc-kv-explorer.types.d.ts'
*/

We could modifiy our plugin to allow this syntax.
The idea would be to first support this feature and then modify the @typedef in our files.
However, we need this CEM PR to be merged and released beforehand:
open-wc/custom-elements-manifest#268

[Galimede]

With the hack introduced in #1468, we should be able to support this feature.