Expose more apis for KubeObjectListLayout usage

[jakolehm]

Usage example:

import { LensRendererExtension, Component, K8sApi } from "@k8slens/extensions";

export class PodsStore extends K8sApi.KubeObjectStore<K8sApi.Pod> {
  api = K8sApi.podsApi;
}

enum sortBy {
  name = "name"
}

export const podsStore = new PodsStore();
K8sApi.apiManager.registerStore(K8sApi.podsApi, podsStore);

export class ExamplePage extends React.Component<{ extension: LensRendererExtension }> {

  async componentDidMount() {
    await podsStore.loadAll()
  }

  render() {
    return (
      <Component.KubeObjectListLayout
        className="Pods" store={podsStore}
        sortingCallbacks={{
          [sortBy.name]: (pod: K8sApi.Pod) => pod.getName()
        }}
        searchFilters={[
          (pod: K8sApi.Pod) => pod.getSearchFields(),
          (pod: K8sApi.Pod) => pod.getStatusMessage(),
        ]}
        renderHeaderTitle="Pods"
        renderTableHeader={[
          { title: "Name", className: "name", sortBy: sortBy.name },
        ]}
        renderTableContents={(pod: K8sApi.Pod) => [
          pod.getName()
        ]}
      />
    )
  }
}