Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ThumbnailSet undocumented
+type ThumbnailSet struct {
+	// Entity is the base model of ThumbnailSet
+	Entity
+	// Large undocumented
+	Large *Thumbnail `json:"large,omitempty"`
+	// Medium undocumented
+	Medium *Thumbnail `json:"medium,omitempty"`
+	// Small undocumented
+	Small *Thumbnail `json:"small,omitempty"`
+	// Source undocumented
+	Source *Thumbnail `json:"source,omitempty"`
+}