feat(rendering): add a "fields-only" mode for validating responses

[stevenpetryk]

At Intercom, we have a need to validate Contentful responses to ensure they match the schema constructed by the codegen. This will prevent our marketing site from building if Contentful content is unexpectedly unpublished, the validations are messed up, or (hopefully) any other discrepancy.

This flag is intended to support the use case where you want to ensure that all of the fields in the Contentful response are well-formed, but don't want to validate auxilliary things like Sys, Assets, etc.

This mode outputs a super minimal codegen file, like this:

export interface IActivePeopleRow {
  fields: {
    /** [Entry Description] */
    entryDescription: string;

    /** Bracket */
    bracket: string;

    // ...
  };
  [otherKeys: string]: any;
}

export interface IBasicHeader {
  fields: {
    /** Description */
    description: string;

    /** Logo Text */
    logoText?: string | undefined;

    // ...
  };
  [otherKeys: string]: any;
}

// ...

[stevenpetryk]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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