[FEATURE] `utils`: Nested config keys manipulation

[Jerrie-Aries]

Summary

Nested config keys manipulation support.

What plugin is the feature request for?

Extended Utils

The Problem

Currently we can only manipulate (set, remove) the root of config keys. Because of that, some base methods were kind of useless on nested keys.

It would be better if we can also manipulate keys in nested dictionary.

The Ideal Solution

Extend the set, get and remove methods of BaseConfig to also support nested keys.

Possible solution:

• Identifier to access deeper key, e.g ., _, / etc.

The Current Solution

Manually access the nested key without method provided by BaseConfig class.

Additional Context

Implementation of this may or may not break some of the plugins. Thorough checks must be done if this were to be added.