WordPress側の情報をmetaタグに出力する (#56)

closes #55 




<!-- This is an auto-generated comment: release notes by OSS CodeRabbit
-->
### Summary by CodeRabbit

- New Feature: Added a "Meta tags" section in the WordPress settings
page, allowing users to input meta tags for Google Tag Manager.
- Refactor: Removed deprecated "Universal Analytics Account Setting"
section from the settings page.
- Refactor: Updated dependencies in the package screen helper and
removed the "ga-custom-dimensions" dependency.
- Refactor: Deprecated `ga-custom-dimensions.js` file and `Accounts`,
`Profiles`, and `Properties` classes in the `ga-communicator` package.
- New Feature: Introduced a new method `render_meta()` in the
`ScriptRenderer` class to render meta tags based on placeholder values.
<!-- end of auto-generated comment: release notes by OSS CodeRabbit -->

assets/js/ga-communicator-setting.js

@@ -3,7 +3,7 @@
 /*!
  * Package screen helper.
  *
- * @deps wp-api-fetch, jquery, wp-i18n, ga-custom-dimensions, ga-sandbox
+ * @deps wp-api-fetch, jquery, wp-i18n, ga-sandbox
  */
 
 const $ = jQuery;

assets/js/ga-custom-dimensions.js

@@ -1,6 +1,7 @@
 /*!
  * Custom dimensions.
  *
+ * @deprecated 3.6.0
  * @package ga-communicator
  * @handle ga-custom-dimensions
  * @deps wp-api-fetch, wp-element, wp-components, wp-i18n