Explicitly surface the concepts of blocks and attributes in the SDK

[paultyng]

Currently the SDK takes resources, schemas, and attributes and makes decisions on what should be blocks, attributes, and object types. This should explicitly be decided by the developer.

[paddycarver]

With the introduction of terraform-plugin-go, I think this is complete. I don't believe there are any plans to bring that functionality to helper/schema.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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