k8s: Extend schema registry authorization method

With changes to authorization configuration options the CRD is updated.

REF:
redpanda-data#6639

src/go/k8s/apis/redpanda/v1alpha1/cluster_types.go

@@ -585,6 +585,9 @@ type SchemaRegistryAPI struct {
 	External *SchemaRegistryExternalConnectivityConfig `json:"external,omitempty"`
 	// TLS is the configuration for schema registry
 	TLS *SchemaRegistryAPITLS `json:"tls,omitempty"`
+	// AuthenticationMethod can enable authentication method per schema registry
+	// listener. Available options are: none, http_basic.
+	AuthenticationMethod string `json:"authenticationMethod,omitempty"`
 }
 
 // SchemaRegistryExternalConnectivityConfig defines the external connectivity