console: rework a bit user management

Notably, HTTP headers are configurable and a provider is used for the
frontend side.

console/authentication/root.go

@@ -0,0 +1,19 @@
+package authentication
+
+import "akvorado/common/reporter"
+
+// Component represents the authentication compomenent.
+type Component struct {
+	r      *reporter.Reporter
+	config Configuration
+}
+
+// New creates a new authentication component.
+func New(r *reporter.Reporter, configuration Configuration) (*Component, error) {
+	c := Component{
+		r:      r,
+		config: configuration,
+	}
+
+	return &c, nil
+}