Feature/mesurement protocol (#62)

closes #61

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

- New Feature: Added GA4 Measurement Protocol support, enabling users to
send post requests directly to the GA4 Measurement Protocol.
- Refactor: Improved code readability and consistency by adjusting
function parameter spacing and renaming variables for clarity.
- Style: Updated PHP linting rules to enforce standard array syntax and
disallow short ternary operators.
- Refactor: Simplified directory handling in `base_dir` method and
improved efficiency of `popular_posts` method.
- New Feature: Introduced a new setting field 'ga4-api-secret' for
enhanced configuration.
- Bug Fix: Ensured type safety in `PlaceHolders.php` by checking if the
queried object is an instance of `WP_Term` before accessing its taxonomy
property.
- Chore: Corrected a typo in a comment in `ScriptRenderer.php` for
better clarity.
<!-- end of auto-generated comment: release notes by OSS CodeRabbit -->

composer.json

@@ -40,10 +40,8 @@
 	},
 	"require-dev": {
 		"phpunit/phpunit": ">=5.7",
-		"squizlabs/php_codesniffer": "^3.0",
-		"wp-coding-standards/wpcs": "^2.0",
+		"wp-coding-standards/wpcs": "^3.0",
 		"yoast/phpunit-polyfills": "^1.0 || ^2.0",
-		"phpcompatibility/php-compatibility": "^9.3",
 		"dealerdirect/phpcodesniffer-composer-installer": "^1.0"
 	},
 	"config": {

ga-communicator.php

@@ -26,14 +26,14 @@
 }
 
 // Initialize plugin.
-add_action( 'plugins_loaded', function() {
+add_action( 'plugins_loaded', function () {
 	// Add i18n
 	load_plugin_textdomain( 'ga-communicator', false, basename( __DIR__ ) . '/languages' );
 	// Load composer.
 	if ( file_exists( __DIR__ . '/vendor-prefixed/vendor/scoper-autoload.php' ) ) {
 		require_once __DIR__ . '/vendor-prefixed/vendor/scoper-autoload.php';
 		// Needs original autoloader.
-		spl_autoload_register( function( $class_name ) {
+		spl_autoload_register( function ( $class_name ) {
 			$class_name = ltrim( $class_name, '\\' );
 			$prefix     = 'Kunoichi\\GaCommunicator';
 			if ( 0 !== strpos( $class_name, $prefix ) ) {
@@ -54,7 +54,7 @@
 } );
 
 // Register Widgets.
-add_action( 'widgets_init', function() {
+add_action( 'widgets_init', function () {
 	register_widget( \Kunoichi\GaCommunicator\Widgets\PopularPosts::class );
 } );