initial proposal for pkg-list from build-order

[memsharded]

Changelog: Feature: Create a pkg-list from a "build-order" json file
Docs: https://github.com/conan-io/docs/pull/XXXX

Close #18962

This is a draft just to think about it, no guarantees. In fact, I see some problematic things:

• As the packages haven't been built, the origin that I am assiging is package list is the "Local Cache". But this will not be correct, it needs to be a package list referenced to the remote containing the uploaded artifacts, but that doesn't happen until the upload.
• It is not possible to filter by context host/build, as there is not full information about it in the graph build-order
• It is not possible to filter by --graph-recipes, for the same reason, the graph build-order does not contain information about the recipes origins, because it is intended for a distributed build.