Added Several New Reference Events (#1500)

* added enum values for new events

* hooked up directory sync event

* upgraded the OrganizationUpgrade ReferenceEvent

* Added metadata to the OrganizationUserInvited event noting if this is the first event sent from an organization

* Added metadata to the AdjustedSeats event

* Implemented vaultImported event

* Implemented FirstGroupAdded event

* Implemented FirstCollectionAdded event

* Implemented FirstSecretAdded event type

* Implemented SalesAssisted reference event

* changed events to match updated requirements

* renamed an event enum

src/Core/Enums/BitwardenClient.cs

@@ -0,0 +1,13 @@
+namespace Bit.Core.Enums
+{
+    public static class BitwardenClient 
+    {
+        public const string
+            Web = "web",
+            Browser = "browser",
+            Desktop = "desktop",
+            Mobile = "mobile",
+            Cli = "cli",
+            DirectoryConnector = "connector";
+    }
+}

src/Core/Enums/ReferenceEventType.cs

@@ -28,5 +28,17 @@ namespace Bit.Core.Enums
         SendCreated,
         [EnumMember(Value = "send-accessed")]
         SendAccessed,
+        [EnumMember(Value = "organization-imported")]
+        DirectorySynced,
+        [EnumMember(Value = "vault-imported")]
+        VaultImported,
+        [EnumMember(Value = "secret-added")]
+        CipherCreated,
+        [EnumMember(Value = "group-created")]
+        GroupCreated,
+        [EnumMember(Value = "collection-created")]
+        CollectionCreated,
+        [EnumMember(Value = "sales-assisted")]
+        SalesAssisted
     }
 }