Add initial Microsoft Teams support

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

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

@@ -0,0 +1,11 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// KeyStringValuePair undocumented
+type KeyStringValuePair struct {
+	// KeyTypedValuePair is the base model of KeyStringValuePair
+	KeyTypedValuePair
+	// Value The string value of the key-value pair.
+	Value *string `json:"value,omitempty"`
+}