feat(render): add 'IEntry' type containing all possible of entries

[GabrielAnca]

I'm proposing adding an IEntry interface (open to discuss about naming 😄 ). This type would represent "an Entry coming from our Contentful instance."

In our case, we end up writing Entry<any> many times, especially in methods used for type checking:

function isHero(entry: Entry<any>): entry is IHero {
  return entry.sys.contentType?.sys.id === 'hero'
}

This allows us to be more specific on the type:

function isHero(entry: IEntry): entry is IHero {
  return entry.sys.contentType?.sys.id === 'hero'
}

[HoriaA]

Nice!

[GabrielAnca]

🎉 This PR is included in version 3.3.0 🎉

The release is available on:

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

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