[Feature]“GetImplicitUsersForResource” cannot support multiple “g”?

[nengc]

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Is your feature request related to a problem? Please describe.
I need to use "GetImplicitUsersForResource", but found only one "g" was supported.
And the model i used like https://editor.casbin.org/#54C9CCD45

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Additional context

[casbin-bot]

@tangyang9464 @JalinWang

[hsluoyz]

@PokIsemaine

[PokIsemaine]

@nengc Yes, this is the current drawback, and we're thinking about how to enhance the API in question.
There are two main aspects:

1. support for multiple g types (This will be achieved as soon as possible)
2. support for inheritance relationships such as resources/obj, domains, and so on (This may take a while)