feat: Added python bindings for casbin::Config

[EmperorYP7]

Fixes #84 partially

Signed-off-by: Yash Pandey (YP) yash.btech.cs19@iiitranchi.ac.in

---

Description

This code:

• Implements python bindings for casbin::Config
• Modified the API to facilitate the bindings
• Added python tests for pycasbin.Config and pycasbin.Model

The workflow enabled by the API exposed to the python side can be abstracted as follows:

import pycasbin as casbin

# For casbin.Config
config = casbin.Config.NewConfig('path/to/config/file.ini')
config = casbin.Config.NewConfigFromText('<contents of the config>')
ok = config.GetBool('<key>')
num_value = config.GetInt('<key')

# ... and so on

# For casbin.Model
model = casbin.Model.NewModel() # empty model
model = casbin.Model.NewModelFromFile('path/to/model.conf')
model = casbin.Model.NewModelFromString('<contents of the model>')

# Demonstrating casbin.Model.LoadModelFromConfig
config = casbin.Config.NewConfig('path/to/model.conf')
model = casbin.Model.NewModel()
model.LoadModelFromConfig(config)

Screenshots

[EmperorYP7]

@hsluoyz @xcaptain Kindly review this one

[github-actions]

🎉 This PR is included in version 1.37.0 🎉

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