Add initial Microsoft Teams support

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

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

@@ -0,0 +1,19 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// ItemActivity undocumented
+type ItemActivity struct {
+	// Entity is the base model of ItemActivity
+	Entity
+	// Access undocumented
+	Access *AccessAction `json:"access,omitempty"`
+	// ActivityDateTime undocumented
+	ActivityDateTime *time.Time `json:"activityDateTime,omitempty"`
+	// Actor undocumented
+	Actor *IdentitySet `json:"actor,omitempty"`
+	// DriveItem undocumented
+	DriveItem *DriveItem `json:"driveItem,omitempty"`
+}