Add initial Microsoft Teams support

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

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

@@ -0,0 +1,19 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// MediaStream undocumented
+type MediaStream struct {
+	// Object is the base model of MediaStream
+	Object
+	// MediaType undocumented
+	MediaType *Modality `json:"mediaType,omitempty"`
+	// Label undocumented
+	Label *string `json:"label,omitempty"`
+	// SourceID undocumented
+	SourceID *string `json:"sourceId,omitempty"`
+	// Direction undocumented
+	Direction *MediaDirection `json:"direction,omitempty"`
+	// ServerMuted undocumented
+	ServerMuted *bool `json:"serverMuted,omitempty"`
+}