feat: new openid connect authentication layer

internal/proxy/director/layer/authn/user.go

@@ -0,0 +1,17 @@
+package authn
+
+type User struct {
+	Subject string         `json:"subject" expr:"subject"`
+	Attrs   map[string]any `json:"attrs" expr:"attrs"`
+}
+
+func NewUser(subject string, attrs map[string]any) *User {
+	if attrs == nil {
+		attrs = make(map[string]any)
+	}
+
+	return &User{
+		Subject: subject,
+		Attrs:   attrs,
+	}
+}