[FC-0099] feat: add admin configuration for CasbinRule model

[BryanttV]

Description

This PR registers the CasbinRule model in the Django Admin. Also linked the ExtendedCasbinRule model to each Casbin Rule.

Testing Instructions

Go to {lms_domain}/admin/casbin_adapter/casbinrule/ and see the table.

Screenshots

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[mariajgrimaldi]

Can we also include the extended model or can we see it as an inline model inside each casbin rule?

[BryanttV]

Thanks for your suggestion! @mariajgrimaldi, I included the ExtendedCasbinRule like an inline model.

[BryanttV]

@mariajgrimaldi, should we only show the ExtendedCasbinRule when the type of the rule is g? Or should we always show it (as it is now)?

[MaferMazu]

This looks good to me, thanks.

The ExtendedCasbinRule object and the subject aren't very useful right now, but for the purpose of this PR and the MVP, I think it is okay.

[mariajgrimaldi]

@mariajgrimaldi, should we only show the ExtendedCasbinRule when the type of the rule is g? Or should we always show it (as it is now)?

It's okay for now! For future visualization, we could also include the subject and scope objects. Let's leave a TODO comment for that :)

[BryanttV]

Thanks! @mariajgrimaldi, I added the TODO comment.