test: add change stream cluster time unified tests

Author: baileympearson

test/spec/change-streams/unified/change-streams-clusterTime.json

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+{
+  "description": "change-streams-clusterTime",
+  "schemaVersion": "1.3",
+  "createEntities": [
+    {
+      "client": {
+        "id": "client0",
+        "useMultipleMongoses": false
+      }
+    },
+    {
+      "database": {
+        "id": "database0",
+        "client": "client0",
+        "databaseName": "database0"
+      }
+    },
+    {
+      "collection": {
+        "id": "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"
+        },
+        {
+          "name": "insertOne",
+          "object": "collection0",
+          "arguments": {
+            "document": {
+              "_id": 1
+            }
+          }
+        },
+        {
+          "name": "iterateUntilDocumentOrError",
+          "object": "changeStream0",
+          "expectResult": {
+            "ns": {
+              "db": "database0",
+              "coll": "collection0"
+            },
+            "clusterTime": {
+              "$$exists": true
+            }
+          }
+        }
+      ]
+    }
+  ]
+}

test/spec/change-streams/unified/change-streams-clusterTime.yml

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+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 }