Pkonfig

Added

- Automate compatibility tests in Python

Changed

- Pass storage to the embedded config attributes during initialization
- Simplifies config `Field` validation and casting flow
- Restructures package internal structure
- Improves unit tests
- Flatten multilevel storage during initialization
- Set type variable for `Field` children based on the returning type
- `Bool` field respects truthy strings like: "1", "Y", "T", "yes", "+" and `1` or `True`
- Import built-in **tomli** package for Python >= 3.11

Removed

- `TypeMapper`
- Metaclass for `Config` creation
- `no_cache` flag
- class-level `Config` attributes won't be converted to `Fields` based on typing or default values;
`Field` should be explicitly used whenever config attribute is defined
- `DebugFlag` field to use just `Bool` instead
- Drop maintenance for Python < 3.9

Added

- `DebuFlag` Field type
- env and dotenv storages now accept any key-value pairs if prefix is None

Fixed

- Fixes issue with empty line parsing in dotenv files.

Added

- Adds installation and quickstart sections

Changed

- Improves alias section docs

Removed

- Remove empty sections from CHANGELOG, they occupy too much space and
create too much noise in the file. People will have to assume that the
missing sections were intentionally left out because they contained no
notable changes.

Changed

- Embedded config respects default values

Changed

- Adds badges indicating PyPi downloads, Python versions, Licence