[Feature] Add hook to alter admin url

[jan-clockworkwp]

Currently in @faustwp/core: 3.0.1 package, there is a way to hook into wpUrl method. But there is no way to hook into the adminUrl, and as far as there is a way to override SiteName link in the custom toolbar with snippet like this:

hooks.addFilter(
      'toolbarNodes',
      'faust',
      (toolbarNodes: FaustToolbarNodes, context: FaustToolbarContext) => {
        const adminUrl = getAdminUrl().replace('/wp-admin', '/wp/wp-admin');
        const customToolbarNodes: FaustToolbarNodes = [
          {
            id: 'site-name',
            location: 'primary',
            component: <SiteName url={adminUrl} />,
          },
        ];

        // Removing default site name node to be able to override admin url
        toolbarNodes = [
          ...toolbarNodes.filter((node) => node.id !== 'site-name'),
        ];

        return [...customToolbarNodes, ...toolbarNodes];
      },
    );

there is no way to override rest of the toolbar items to render proper admin urls.

Would be great if we could do something like:

// @note: wpAdminUrl filter is not currently part of @faustwp/core package
hooks.addFilter('wpAdminUrl', 'faust', (url: string) => {
  return url.replace('/wp-admin', '/wp/wp-admin'); // or whatever admin url modification is needed
});

There is a similar request to this one, but it is related to WordPress faustwp plugin #1872 (comment)