Implement server-side registry for Abilities API

.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.txt,wp-config-sample.php}]
+end_of_line = crlf

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/9.2/phpunit.xsd"
+		bootstrap="tests/bootstrap.php"
+		backupGlobals="false"
+		colors="true"
+		beStrictAboutTestsThatDoNotTestAnything="true"
+		beStrictAboutOutputDuringTests="true"
+		convertErrorsToExceptions="true"
+		convertWarningsToExceptions="true"
+		convertNoticesToExceptions="true"
+		convertDeprecationsToExceptions="true"
+		>
+    <testsuites>
+        <testsuite name="unit">
+            <directory suffix="Test.php">tests/unit</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

src/abilities-api.php

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+<?php declare( strict_types = 1 );
+
+/**
+ * Abilities API
+ *
+ * Defines functions for managing abilities in WordPress.
+ *
+ * @package WordPress
+ * @subpackage Abilities API
+ * @since 0.1.0
+ */
+
+/**
+ * Registers a new ability using Abilities API.
+ *
+ * Note: Do not use before the {@see 'abilities_api_init'} hook.
+ *
+ * @see WP_Abilities_Registry::register()
+ *
+ * @since 0.1.0
+ *
+ * @param string|WP_Ability $name       The name of the ability, or WP_Ability instance. The name must be a string
+ *                                      containing a namespace prefix, i.e. `my-plugin/my-ability`. It can only
+ *                                      contain lowercase alphanumeric characters, dashes and the forward slash.
+ * @param array             $properties Optional. An associative array of properties for the ability. This should
+ *                                      include `label`, `description`, `input_schema`, `output_schema`,
+ *                                      `execute_callback`, `permission_callback`, and `meta`.
+ * @return ?WP_Ability An instance of registered ability on success, null on failure.
+ */
+function wp_register_ability( $name, array $properties = array() ): ?WP_Ability {
+	if ( ! did_action( 'abilities_api_init' ) ) {
+		_doing_it_wrong(
+			__FUNCTION__,
+			sprintf(
+				/* translators: 1: abilities_api_init, 2: string value of the ability name. */
+				esc_html__( 'Abilities must be registered on the %1$s action. The ability %2$s was not registered.' ),
+				'<code>abilities_api_init</code>',
+				'<code>' . esc_attr( $name ) . '</code>'
+			),
+			'0.1.0'
+		);
+		return null;
+	}
+
+	return WP_Abilities_Registry::get_instance()->register( $name, $properties );
+}
+
+/**
+ * Unregisters an ability using Abilities API.
+ *
+ * @see WP_Abilities_Registry::unregister()
+ *
+ * @since 0.1.0
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return ?WP_Ability The unregistered ability instance on success, null on failure.
+ */
+function wp_unregister_ability( string $name ): ?WP_Ability {
+	return WP_Abilities_Registry::get_instance()->unregister( $name );
+}
+
+/**
+ * Retrieves a registered ability using Abilities API.
+ *
+ * @see WP_Abilities_Registry::get_registered()
+ *
+ * @since 0.1.0
+ *
+ * @param string $name The name of the registered ability, with its namespace.
+ * @return ?WP_Ability The registered ability instance, or null if it is not registered.
+ */
+function wp_get_ability( string $name ): ?WP_Ability {
+	return WP_Abilities_Registry::get_instance()->get_registered( $name );
+}
+
+/**
+ * Retrieves all registered abilities using Abilities API.
+ *
+ * @see WP_Abilities_Registry::get_all_registered()
+ *
+ * @since 0.1.0
+ *
+ * @return WP_Ability[] The array of registered abilities.
+ */
+function wp_get_abilities(): array {
+	return WP_Abilities_Registry::get_instance()->get_all_registered();
+}