Feature Request: Export union of all entries

[penx]

Would it be possible to export a union of all generated Entries/Content Types?

Use cases:

• When I call ContentfulClientApi.getEntries<T> I know I should be passing one of these types in as the generic, so it would be useful for me to apply this guard before the getEntries call to ensure a valid generic type has been passed.
• If I have a renderer function intended to handle all entry types, I could also utilise this generated union to ensure I have handled all possible entry types, potentially using union type subtraction for cases I know I'm not handling.
• Once the property type guard is available, I can use entry.sys.contentType.sys.id to infer the type of entry.sys

[patrick-mcdougle]

Similar / related to this request it would also be cool to get a type that maps CONTENT_TYPE names to their interface types.

For example:

export type ContentTypeMap = {
    aContentTypeKey: IAContentType;
   // ...
}