Allow overriding computability + implement for resources/data sources

[austinvalle]

Closes #11
(Should merge following #10 to see better diffs on the generated filed 👍🏻)

This PR introduces a GlobalSchemaOpts struct and OverrideComputability field that is recursively passed through an OASSchema as it is building resource + data source attributes.

This allows us to override an OAS's required property when it doesn't make sense to check it, like in the case of a GET response body marking fields as required.

If you look at internal/cmd/testdata/github/generated_framework_ir.json in this PR, you can see it now better reflects the actual POST API requirements for a repo, where:

• Only owner and repo are required for the READ/data source, see REST API docs
• Only name is required for the POST/resource, see REST API docs

Note

• Also renamed behavior in favor of computability when referring to the Computed, Optional, Required combinations.

[austinvalle]

Generated IR JSON files are all up to date 👍🏻 - you can now see how many attributes were being incorrectly marked as required 😆

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