Fix broken database relation request parameters.

Author: gehongyan

Src/Notion.Client/Api/Databases/RequestParams/DatabasesCreateParameters/PropertySchema/RelationPropertySchema.cs

@@ -1,23 +1,10 @@
-using System;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace Notion.Client
 {
     public class RelationPropertySchema : IPropertySchema
     {
         [JsonProperty("relation")]
-        public RelationInfo Relation { get; set; }
-
-        public class RelationInfo
-        {
-            [JsonProperty("database_id")]
-            public Guid DatabaseId { get; set; }
-
-            [JsonProperty("synced_property_id")]
-            public string SyncedPropertyId { get; set; }
-
-            [JsonProperty("synced_property_name")]
-            public string SyncedPropertyName { get; set; }
-        }
+        public RelationData Relation { get; set; }
     }
 }

Src/Notion.Client/Api/Databases/RequestParams/DatabasesUpdateParameters/PropertySchema/RelationUpdatePropertySchema.cs

@@ -1,23 +1,10 @@
-using System;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace Notion.Client
 {
     public class RelationUpdatePropertySchema : UpdatePropertySchema
     {
         [JsonProperty("relation")]
-        public RelationInfo Relation { get; set; }
-
-        public class RelationInfo
-        {
-            [JsonProperty("database_id")]
-            public Guid DatabaseId { get; set; }
-
-            [JsonProperty("synced_property_id")]
-            public string SyncedPropertyId { get; set; }
-
-            [JsonProperty("synced_property_name")]
-            public string SyncedPropertyName { get; set; }
-        }
+        public RelationData Relation { get; set; }
     }
 }