[feature] create casbin-python-cli to use PyCasbin in CLI

[hsluoyz]

For now, Casbin is mainly a library, or sometimes as a service. It also can be a CLI tool. So we can call jCasbin in shell.

At least, we need to support basic model, adapter, enforcer APIs this time: https://casbin.org/docs/model-storage, https://casbin.org/docs/policy-storage

Refer to:

• https://www.openpolicyagent.org/docs/latest/cli/
• https://docs.cerbos.dev/cerbos/latest/cli/index.html

Similar to:

• Go: [feature] support CLI usage for Casbin (Casbin for Golang) casbin#1414
• Java: [feature] support CLI usage for jCasbin (Casbin for Java) jcasbin#400

Existing CLI repos:

• Go: https://github.com/casbin/casbin-go-cli
• Java: https://github.com/jcasbin/casbin-java-cli

The output for this issue will be in:

• Python: https://github.com/officialpycasbin/casbin-python-cli

[casbin-bot]

@techoner @Nekotoxin