Commits on Dec 19, 2022

1. Move "global variable" related utilities to dedicated `WPGlobalVariab… …

   …lesHelper`
   
   The "global variable" related utilities are only used by a small number of sniffs, so are better placed in a dedicated class.
   
   This commit moves the `$wp_globals` property to a new `WordPressCS\WordPress\Helpers\WPGlobalVariablesHelper` and starts using that class in the relevant sniffs.
   
   Note:
   * The property is now `private` (and `static`).
       This protects the property against inadvertent changes.
   * Access to the property can be obtained via the new `WPGlobalVariablesHelper::get_names()` method.
   * Alternatively, the new `WPGlobalVariablesHelper::is_wp_global()` method can be used to check is a given variable name is the name of a WP global variable.
   
   Related to 1465

   

   jrfnl committed Dec 19, 2022
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