feat: extract only run-archive
Overview
Fixes: https://github.com/prefix-dev/pixi/issues/2805
Use run-exports-cache from rattler.
Tested by building rich recipe from test-data and make sure that cache was populated and run_exports fields filled.
I'll merge this after #1453 and rebase and remove the updates as the changes in rattler should be released now :)
i have one last question: when actually building a package will this now download the whole package twice? Once to get the run exports, and once to actually build things? I think we should decide based on a "render-only" mode wether to only download to the run exports cache or whether to actually download & unpack.