[Feature] Add arbitrary section in config.toml

[celek]

What problem or use case are you trying to solve?
Ability to create my own section : foo in config.toml, allowing me to access variable like this

config.extended.foo.var1
config.extended.foo.var2

Section will look like this

[foo]
var1 = val1
var2 = val2

Describe the UX of the solution you'd like
As a OH extender I am able to create my own personal section in the config.toml file
as a OH extener, I am able to retrieve the variable defined in my own section in config.toml

Do you have thoughts on the technical implementation?
Read the section name, create a new dict in config, read each var/val and add them to the dict

Describe alternatives you've considered
Using ENV variables work, I will still use ENV variable for secret values and not store them in config,toml

Additional context

possible code

elif not key.startswith('sandbox') and key.lower() != 'core':
(...)
extended_config = ExtendedConfig.add_dict(key, value)
cfg.extended.add(key, extended_config)