add simple webhook feature for peer, interface and user events (#398)

internal/config/webhook.go

@@ -0,0 +1,14 @@
+package config
+
+import "time"
+
+// WebhookConfig contains the configuration for webhooks.
+type WebhookConfig struct {
+	// Url is the URL to send the webhook to. If empty, no webhook will be sent.
+	Url string `yaml:"url"`
+	// Authentication is the authorization header for the webhook request.
+	// It can either be a Bearer token or a Basic auth string.
+	Authentication string `yaml:"authentication"`
+	// Timeout is the timeout for the webhook request.
+	Timeout time.Duration `yaml:"timeout"`
+}