R#2040 Upload an experiment description to portal

Title: Upload an experiment description to portal

Actor: Experimenter

Description

It will be possible to upload just a YAML descriptor created on some other tool, through the portal. The experimenter will upload an experiment description based on YAML. More Experiment metadata: name, creation date, etc must also be available during upload

Tracked by issues:

• https://github.com/5GinFIRE/eu.5ginfire.portal.web/issues/8