Update cdb_schema.json from CDB API

[GreenXenith]

Whether by release script or automatically on occasion. cdb_schema is likely to get out of date often.

[AFCMS]

Not sure if the bundled schema shouldn't be removed entirely to rely solely on the CDB URL. Back then I only had part time internet access I thought it would be good to still have completion offline but you need internet access to publish to CDB anyways.

You still get a warning offline IIRC so the current solution isn't perfect. A better fix would be a cache for completion schemas on the VSCode side.