Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// EmailActivityStatistics undocumented
+type EmailActivityStatistics struct {
+	// ActivityStatistics is the base model of EmailActivityStatistics
+	ActivityStatistics
+	// AfterHours undocumented
+	AfterHours *time.Duration `json:"afterHours,omitempty"`
+	// ReadEmail undocumented
+	ReadEmail *time.Duration `json:"readEmail,omitempty"`
+	// SentEmail undocumented
+	SentEmail *time.Duration `json:"sentEmail,omitempty"`
+}