Add web worker offloading plugin

[thelovekesh]

Summary

Fixes #176

Previously: #556

Relevant technical choices

• Add Web Worker Offloading standalone plugin which allows running scripts within the worker thread with the help of the Partytown library.
• Add the wwo_configuration filter which can be used to update web worker configurations.

Testing steps

• Enable this performance plugin or use wp-env in which this plugin is enabled by default on this branch.

• Add a JS script with web-worker-offloader as a dependency. When the page is loaded, the JS script should be loaded within the web worker.

  function enqueue_non_critical_js() {
      wp_enqueue_script(
    	  'non-critical-js',
    	  '/path/to/non-critical.js',
    	  array( 'web-worker-offloader' ), // Note the `web-worker-offloader` being added as a dep
    	  '1.0.0',
    	  true
      );
  }
  add_action( 'wp_enqueue_scripts', 'enqueue_non_critical_js' );

• Use wwo_configuration hook to update web worker configurations.

  function update_wwo_config( $config ) {
    $config["debug"] = true;
    return $config;
  }
  add_filter( 'wwo_configuration', 'update_wwo_config' );

[thelovekesh]

@westonruter @adamsilverstein I have converted this into a standalone plugin. Next, I'll add a settings page to opt-in offloading for scripts listed in the Partytown documentation (https://partytown.builder.io/common-services). This way, the WordPress plugin team won't classify it as a "framework" plugin, as @westonruter previously mentioned.

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Co-authored-by: thelovekesh <thelovekesh@git.wordpress.org>
Co-authored-by: westonruter <westonruter@git.wordpress.org>
Co-authored-by: eclarke1 <clarkeemily@git.wordpress.org>
Co-authored-by: adamsilverstein <adamsilverstein@git.wordpress.org>
Co-authored-by: bethanylang <mxbclang@git.wordpress.org>
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