Add initial Microsoft Teams support

Documentation on https://github.com/42wim/matterbridge/wiki/MS-Teams-setup

vendor/github.com/yaegashi/msgraph.go/beta/ItemActivityOLDModel.go

@@ -0,0 +1,19 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ItemActivityOLD undocumented
+type ItemActivityOLD struct {
+	// Entity is the base model of ItemActivityOLD
+	Entity
+	// Action undocumented
+	Action *ItemActionSet `json:"action,omitempty"`
+	// Actor undocumented
+	Actor *IdentitySet `json:"actor,omitempty"`
+	// Times undocumented
+	Times *ItemActivityTimeSet `json:"times,omitempty"`
+	// DriveItem undocumented
+	DriveItem *DriveItem `json:"driveItem,omitempty"`
+	// ListItem undocumented
+	ListItem *ListItem `json:"listItem,omitempty"`
+}