Add initial Microsoft Teams support

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

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

@@ -0,0 +1,19 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// Endpoint undocumented
+type Endpoint struct {
+	// DirectoryObject is the base model of Endpoint
+	DirectoryObject
+	// Capability undocumented
+	Capability *string `json:"capability,omitempty"`
+	// ProviderID undocumented
+	ProviderID *string `json:"providerId,omitempty"`
+	// ProviderName undocumented
+	ProviderName *string `json:"providerName,omitempty"`
+	// URI undocumented
+	URI *string `json:"uri,omitempty"`
+	// ProviderResourceID undocumented
+	ProviderResourceID *string `json:"providerResourceId,omitempty"`
+}