✨ Expose better errors

[GauBen]

GraphQL v16.5.0 has introduced new types that we can leverage to expose better errors.

Features introduced by this PR:

• [x] Introduced a new class named ZeusError, replacing the confusing GraphQLError
• [x] Expose errors as an array of GraphQLErrors
• [x] ZeusError is fully serializable and parse-able (new ZeusError(JSON.parse(JSON.serialize(zeusError))) works great if you don't care about stack-traces)

Breaking changes: none

I also refreshed the examples.

[aexol]

Thank you so much! Will review later today