Configurable serializer for *.strories.(json|yaml)

Problem/Motivation

Based on the default configuration in .stroybook/main.ts file I assume that storybook also supports YAML format for story definitions.

const config: StorybookConfig = {
  stories: [
    "../stories/**/*.mdx",
    "../stories/**/*.stories.@(json|yaml|yml)",
  ],
};

I think it would be more human and Drupal developer friendly to use YAML instead of JSON,
and YAML format is the more commonly used one in a Drupal project.

Proposed resolution

Add a new --file-format option to the storybook:generate-all-stories and storybook:generate-stories Drush commands.

(Or at least add the following flags to the \json_encode(): \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE if it is still usable for storybook)

Remaining tasks

1. Approval from the maintainer
2. do it