`add_managed_node` now match node when they are exactly the same by default, but if the
new `strict_match` argument is set to `False`, the old behaviour of matching all node
which start with the given `node` argument is used.
rel 475
This is a huge configuration refactoring.
The configuration system now uses Pydantic settings, with better validation, better
support for environment variables and other goodies.
The main config files now use TOML instead of INI, this allow for better handling of
complex types, notably dict.
Plugins, components and frontends can declare their config settings in a class which will
be imported dynamically.
