consider using query instead of fragment

[akosyakov]

Hi 👋 We are trying to run this extension in Theia: eclipse-theia/theia#6763

And stumbled over the issue that TextDocumentContentProvider rely on URI fragment. Theia separates a fragment from URI to adhere to https://tools.ietf.org/html/rfc3986#section-3.5 and avoid duplicate content resolution and editors:

As such, the fragment identifier is not used in the scheme-specific processing of a URI; instead, the fragment identifier is separated from the rest of the URI prior to a dereference, and thus the identifying information within the fragment itself is dereferenced solely by the user agent, regardless of the URI scheme.

Would you consider to use query instead of fragment? Query is schema specific and can be used to resolve different content.

[WebFreak001]

good point, not quite sure why I even put it in fragment instead of query because I implemented full query argument parsing for it