Resolve "Using nomad-lab"

This solves a few issues related to !2059.

• loading schema packages during nomad parse. Without this, the metainfo package aliases do not work
• using label instead of name in m_package = Package(label='human redable name'). The name` cannot be set: it will always be overwritten with the qualified python name
• a simple cli command to list the installed plugins.

The main problem remains:

• plugins currently can only be loaded with parser required schema and normalizer plugins are installed

@ladinesa @himanel1