[✨] Remove`loader$` data from `qwik/json`

[zanettin]

Is your feature request related to a problem?

At the moment all data returned from an onGet / loader$ function usage, are included in the qwik/json data, even if the data are no longer used on the client. in cases where a lot of data are aggregated for creating the initial HTML on the server this could lead to heavy HTML files. Streaming helps of corse but as a further optimization we should also consider reducing the qwik/json size where possible.

Describe the solution you'd like

If the data are just need on the server, they should no longer be part of the qwik/json and be removed like it is the case on other frameworks (astro).

Describe alternatives you've considered

Instead of automatically remove this data we could mybe add a config option/reducer fn to limit the data somehow.

Additional context

No response