Add enforcer context support

[nodece]

Summary

Currently, multiple-sections-type has been supported, we need to pass a context to enforce when using this feature.

[casbin-bot]

@Gabriel-403 @Zxilly @kingiw @nodece

[nodece]

You can get started with Casbin documentation, and use casbin.js in your machine, the casbin-editor is developed based on casbin.js, So once you know how to use casbin.js, you can work on this.