Allow Prepared Queries to return Critical Nodes

#### Feature Description

Allow for a new parameter of prepared query which will allow the query to return failing nodes.

#### Use Case(s)

We are looking at changing our usage of Consul to move from the `/health/service` endpoint to using prepared queries. Occasionally, we would like to use a service in a `critical` status as the final fallback if there are no available services in a passing or warning state. Right now the service endpoint will return those nodes, we would like to be able to replicate that behavior with a prepared query.

Ideally, the failing nodes would only be returned as the last ones.