Configurable TypeScript types for query result errors

[SeppahBaws]

Describe the feature

Currently we only define the "message" property on the query result error type, but in reality the spec also defines optional locations, path and extensions properties.

The shape of the extensions field is a map that is up to the server implementation to fill out. It might be useful for Houdini users to define a type that matches the response of the server they're using.

link to relevant GraphQL spec: https://spec.graphql.org/October2021/#sec-Errors

Criticality

cool improvement, my projects will benefit from it

[aviallon]

This looks like a good first issue 😄