RFE - Support for TOML blueprints

[oglok]

Currently this collection translates a set of ansible vars into a transient blueprint in TOML format. That has two drawbacks:

• Customers already using Image Builder and building their own TOML blueprints, need to translate it to ansible vars (to then internally go back to the TOML format) and might be discouraging to use the collection. Furthermore, user might be already storing the TOML files and use them in a declarative way.
• The Ansible Collection would need to keep up on supporting new features exposed by OSBUILD from the blueprints, like [[containers]], [[firmware]], etc.

[luisarizmendi]

I did a quick add to the collection in order to be able to use TOML files:
#357

I need it in this case because the collection still does not support the [[containers]] section:
#331