RUBY-3106 add spec test for ChangeStreamEvent type definition to include clusterTime (#2613)

Author: neilshweky

spec/spec_tests/data/change_streams_unified/change-streams-clusterTime.yml

@@ -0,0 +1,40 @@
+description: "change-streams-clusterTime"
+schemaVersion: "1.3"
+createEntities:
+  - client:
+      id: &client0 client0
+      useMultipleMongoses: false
+  - database:
+      id: &database0 database0
+      client: *client0
+      databaseName: *database0
+  - collection:
+      id: &collection0 collection0
+      database: *database0
+      collectionName: *collection0
+
+runOnRequirements:
+  - minServerVersion: "4.0.0"
+    topologies: [ replicaset, sharded-replicaset, load-balanced, sharded ]
+
+initialData:
+  - collectionName: *collection0
+    databaseName: *database0
+    documents: []
+
+tests:
+  - description: "clusterTime is present"
+    operations:
+      - name: createChangeStream
+        object: *collection0
+        arguments: { pipeline: [] }
+        saveResultAsEntity: &changeStream0 changeStream0
+      - name: insertOne
+        object: *collection0
+        arguments:
+          document: { _id: 1 }
+      - name: iterateUntilDocumentOrError
+        object: *changeStream0
+        expectResult:
+          ns: { db: *database0, coll: *collection0 }
+          clusterTime: { $$exists: true }