Update casbin-orm-adapter model name

[conghuhu]

I think it's better to modify this piece to be consistent with the examples

Fix: #2

[CLAassistant]

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[hsluoyz]

@conghuhu plz fix:

[hsluoyz]

@rushitote plz review

[rushitote]

I am not sure if we should do it this way, because then the module will need to be imported by require("CasbinAdapter") - which is too general and doesn't specify what kind of adapter is this.

Instead we could rename the file to CasbinORMAdapter.lua for consistency, what do you think?

[conghuhu]

OK, then I will continue to use CasbinORMAdapter

[hsluoyz]

@rushitote if this is the case, actually we have another ORM adapter: https://github.com/casbin-lua/luasql-adapter , so CasbinORMAdapter is perhaps not a good name either. What about 4DaysOrmAdapter or 4DaysORMAdapter?

• Can we remove the Casbin prefix?
• ORM or Orm?

[rushitote]

@hsluoyz
Yes, 4DaysOrmAdapter seems great and I think we can keep it Orm since it's a common acronym.

[hsluoyz]

@conghuhu plz use this name: 4DaysOrmAdapter