[api] schema: extendedOptions as untyped object (#327)

`extendedOptions` are used to store unstructured metadata. This PR
ensures the OpenAPI schema reflects that.

Author: schallert

bundle.yaml

@@ -3382,14 +3382,8 @@ spec:
                             options.
                           properties:
                             options:
-                              additionalProperties:
-                                description: RawMessage is a raw encoded JSON value.
-                                  It implements Marshaler and Unmarshaler and can
-                                  be used to delay JSON decoding or precompute a JSON
-                                  encoding.
-                                format: byte
-                                type: string
                               type: object
+                              x-kubernetes-preserve-unknown-fields: true
                             type:
                               type: string
                           type: object

helm/m3db-operator/templates/00_operator.m3db.io_m3dbclusters.yaml

@@ -3374,14 +3374,8 @@ spec:
                             options.
                           properties:
                             options:
-                              additionalProperties:
-                                description: RawMessage is a raw encoded JSON value.
-                                  It implements Marshaler and Unmarshaler and can
-                                  be used to delay JSON decoding or precompute a JSON
-                                  encoding.
-                                format: byte
-                                type: string
                               type: object
+                              x-kubernetes-preserve-unknown-fields: true
                             type:
                               type: string
                           type: object

pkg/apis/m3dboperator/v1alpha1/namespace.go

@@ -102,7 +102,10 @@ type DownsampleOptions struct {
 
 // ExtendedOptions stores the extended namespace options.
 type ExtendedOptions struct {
-	Type    string                     `json:"type,omitempty"`
+	Type string `json:"type,omitempty"`
+	// +kubebuilder:pruning:PreserveUnknownFields
+	// +kubebuilder:validation:Schemaless
+	// +kubebuilder:validation:Type=object
 	Options map[string]json.RawMessage `json:"options,omitempty"`
 }