Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// CalendarGroup undocumented
+type CalendarGroup struct {
+	// Entity is the base model of CalendarGroup
+	Entity
+	// Name undocumented
+	Name *string `json:"name,omitempty"`
+	// ClassID undocumented
+	ClassID *UUID `json:"classId,omitempty"`
+	// ChangeKey undocumented
+	ChangeKey *string `json:"changeKey,omitempty"`
+	// Calendars undocumented
+	Calendars []Calendar `json:"calendars,omitempty"`
+}