Add Conditions to LDAPIdentityProvider's Status and start to fill them

- The ldap_upstream_watcher.go controller validates the bind secret and
  uses the Conditions to report errors. Shares some condition reporting
  logic with its sibling controller oidc_upstream_watcher.go, to the
  extent which is convenient without generics in golang.

apis/supervisor/idp/v1alpha1/types_ldapidentityprovider.go.tmpl

@@ -26,6 +26,13 @@ type LDAPIdentityProviderStatus struct {
 	// +kubebuilder:default=Pending
 	// +kubebuilder:validation:Enum=Pending;Ready;Error
 	Phase LDAPIdentityProviderPhase `json:"phase,omitempty"`
+
+	// Represents the observations of an identity provider's current state.
+	// +patchMergeKey=type
+	// +patchStrategy=merge
+	// +listType=map
+	// +listMapKey=type
+	Conditions []Condition `json:"conditions,omitempty" patchStrategy:"merge" patchMergeKey:"type"`
 }
 
 type LDAPIdentityProviderTLSSpec struct {