Support new brokenRoute parameter in types

[lihbr]

Is your feature request related to a problem? Please describe.

Following the recent route resolver update, a new brokenRoute API query parameter is available. It allows users to define a fallback URL that will be resolved for fields featuring a broken link. Typical use case would be brokenRoute: "/404" to make all broken links populated with a /404 URL.

Describe the solution you'd like

Support is technically already here, but is not typed.

Type should be brokenRoute?: string

Describe alternatives you've considered

N/A

Additional context

Internal thread: https://prismic-team.slack.com/archives/CB6AJT98F/p1660692486110229

[angeloashmore]

Implemented in #258 along with the new uid option, pending a review. 🙂