Add initial Microsoft Teams support

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

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

@@ -0,0 +1,11 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// PendingOperations undocumented
+type PendingOperations struct {
+	// Object is the base model of PendingOperations
+	Object
+	// PendingContentUpdate undocumented
+	PendingContentUpdate *PendingContentUpdate `json:"pendingContentUpdate,omitempty"`
+}