This feature brings the support for multi-condition rules, which literally
means you can pass multiple conditions to trigger a single rule. The change
is backward-compatible and would ideally be shipped by mid-July or end-of-July
and it's gonna be deployed by June 19th for us to implement.

1. The feature is about exposing a new conditions array of rule conditions
   in the rule object. The existing condition field remains for
   backward-compatibility.
2. Also, please update the CTS like so: https://github.com/algolia/algoliasearch-client-specs-internal/pull/126/files.
3. Mark the condition key as deprecated.