Add initial Microsoft Teams support

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

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

@@ -0,0 +1,21 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// ActivityStatistics undocumented
+type ActivityStatistics struct {
+	// Entity is the base model of ActivityStatistics
+	Entity
+	// Activity undocumented
+	Activity *AnalyticsActivityType `json:"activity,omitempty"`
+	// StartDate undocumented
+	StartDate *time.Time `json:"startDate,omitempty"`
+	// EndDate undocumented
+	EndDate *time.Time `json:"endDate,omitempty"`
+	// TimeZoneUsed undocumented
+	TimeZoneUsed *string `json:"timeZoneUsed,omitempty"`
+	// Duration undocumented
+	Duration *time.Duration `json:"duration,omitempty"`
+}