ESLint Warning n/no-missing-import

With https://github.com/eclipse-thingweb/node-wot/pull/1424 we introduced some *new* eslint warnings.

One warning is `n/no-missing-import`

https://github.com/eclipse-thingweb/node-wot/blob/736f2803f3eceac36919d0455d7713272bbcad46/eslint.config.mjs#L79-L82

Which shows for *normal* imports like

https://github.com/eclipse-thingweb/node-wot/blob/736f2803f3eceac36919d0455d7713272bbcad46/packages/core/src/codecs/base64-codec.ts#L16

To fix it (as the comment above alludes), one needs to change

`import { ContentCodec } from "../content-serdes"; `

to

`import { ContentCodec } from "../content-serdes.js"; `

Do we really want to do that? I think it works but to me, it looks somewhat silly in a TS project to reference JS files?

Opinions?