Sami Hiltunen authored Feb 17, 2023 and Robert Marshall committed Feb 17, 2023

The configuration formats of Praefect and Omnibus deviate from each
other creating a few problems:

1. Configuration keys for the same option differ between the context of
   Omnibus and Praefect creating confusion for the user.

2. Each new key added requires duplicate work to map the different keys
   into Omnibus.

This change introduces praefect['configuration'] matching configuration
in Omnibus with Praefect's own format. The previous configuration keys
are remapped into this new format to assist administrators during the
transition period.

The tomlrb gem does not supporting encoding TOML, so the tomlib gem has
been added as a dependency. The configuration values are now serialized
directly into TOML instead of using a template.

Removes unneeded values allowing Praefect's own source to be the single
source of truth for configuration.

Updates tests because the new serialization method does not output empty
config sections.

Guards are included to pre...