Enhance functionality related to overriding or defining new properties for an attribute

[AgustinBettati]

Context and use case

Currently the generator config allows overriding of attributes, but limits its functionality to modifying the description property:

schema:
      attributes:
        overrides:
          labels:
            description: other description

I have been trying this tool with the intention of replacing existing manual schema and type definitions with autogenerated ones using an existing API spec. In order to reach this parity there are several properties that are missing in the resulting provider code specification generated from the API spec, which is reasonable as the API spec lacks terraform-specific information.

Enhancement request

Here is a list of use cases I found would be useful for defining within the generator config:

• Define plan modifiers for specific attributes. This is useful for common plan modifiers such as RequiresReplace and UseStateForUnkown.
• Define validators for specific attributes. Apart from validators that are generated from API Spec properties, there are other validations such as ConflictsWith which cannot be represented easily in an OpenAPI Spec.
• Allow overriding the resulting name of an attribute, giving flexibility in the case that terraform schema has a different name from the definition in the API.
• Marking an attribute as sensitive. This is information that likely cannot be inferred from the API Spec but highly relevant for terraform schema.
• Allow override of the computed_optional_required property for an attribute. While the tool has a certain logic to define this value for attributes, it would be helpful to give flexibility to the user to cover specific edge cases.

[austinvalle]

Combining this request with #86 as they are closely related 👍🏻

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