DXCDT-360: Move organization resources to dedicated pkg

[sergiught]

🔧 Changes

In this PR we are getting closer and closer to our ideal package structure:

.
└── terraform-provider-auth0/
    └── internal/
        ├── mutex
        ├── provider
        ├── auth0/
        │   ├── client/
        │   │   ├── data_source.go
        │   │   ├── resource.go
        │   │   ├── resource_global.go
        │   │   ├── flatten.go
        │   │   └── expand.go
        │   ├── connection/
        │   │   ├── data_source.go
        │   │   ├── resource.go
        │   │   ├── flatten.go
        │   │   └── expand.go
        │   ├── organization/
        │   │   ├── data_source.go
        │   │   ├── resource.go
        │   │   ├── resource_connection.go
        │   │   ├── resource_member.go
        │   │   ├── flatten.go
        │   │   └── expand.go
        │   └── ...
        ├── recorder
        ├── sweep
        ├── template
        ├── validation
        └── value

We migrate all organization related resources and data sources to their own organization pkg.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[willvedd]

Really loving the incremental improvements with this one. A true n+1!