Do not exclude constants from type definitions

[Vinnl]

We don't want people to use them directly, so they're undocumented,
but they should be available for apps that compile our TypeScript
themselves (like Angular apps, apparently).

This PR should fix #608.

• I've added a unit test to test for potential regressions of this bug. N/A
• The changelog has been updated, if applicable.
• Commits in this PR are minimal and have descriptive commit messages.

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[pmcb55]

LGTM - just to note, the issue seems to have arisen via the exposure of this type definition in control.ts which references acp.accessControl directly:

export type WithLinkedAcpAccessControl<
  Resource extends WithServerResourceInfo = WithServerResourceInfo
> = Resource & {
  internal_resourceInfo: {
    linkedResources: {
      [acp.accessControl]: [string];
    };
  };
};