feat/type guard renderer

[marcolink]

Create a type-guard function for every content type

Example:

import type { Entry, EntryFields } from "contentful";
import type { SysWithContentTypeLinkId } from "TypeGuardTypes";

export interface TypeAnimalFields {
    bread: EntryFields.Symbol;
}

export type TypeAnimal = Entry<TypeAnimalFields>;

export function isTypeAnimal(entry: SysWithContentTypeLinkId): entry is TypeAnimal {
    return entry.sys.contentType.sys.id === 'animal'
}

cc @veu