Add initial Microsoft Teams support

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

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

@@ -0,0 +1,23 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// AttributeMapping undocumented
+type AttributeMapping struct {
+	// Object is the base model of AttributeMapping
+	Object
+	// DefaultValue undocumented
+	DefaultValue *string `json:"defaultValue,omitempty"`
+	// ExportMissingReferences undocumented
+	ExportMissingReferences *bool `json:"exportMissingReferences,omitempty"`
+	// FlowBehavior undocumented
+	FlowBehavior *AttributeFlowBehavior `json:"flowBehavior,omitempty"`
+	// FlowType undocumented
+	FlowType *AttributeFlowType `json:"flowType,omitempty"`
+	// MatchingPriority undocumented
+	MatchingPriority *int `json:"matchingPriority,omitempty"`
+	// Source undocumented
+	Source *AttributeMappingSource `json:"source,omitempty"`
+	// TargetAttributeName undocumented
+	TargetAttributeName *string `json:"targetAttributeName,omitempty"`
+}