Add initial functionality and tests

.editorconfig

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+# EditorConfig helps maintain consistent coding styles for developers working on the same project across various editors and IDEs.
+# See https://editorconfig.org.
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.php]
+indent_size = 4
+indent_style = tab
+
+[*.xml]
+indent_size = 4

.gitattributes

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+#
+# Exclude these files from release archives.
+#
+# This will also make the files unavailable when using Composer with `--prefer-dist`.
+# If you develop using Composer, use `--prefer-source`.
+#
+# Via WPCS.
+#
+/.github export-ignore
+/.editorconfig export-ignore
+/.php-cs-fixer.dist.php export-ignore
+/phpcs.xml export-ignore
+/phpstan.neon export-ignore
+/phpunit.xml export-ignore
+/tests export-ignore
+
+#
+# Auto detect text files and perform LF normalization.
+#
+# http://davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+#
+* text=auto
+
+#
+# The above will handle all files not found below.
+#
+*.md text
+*.php text
+*.inc text

.github/pull_request_template.md

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+## Summary
+
+As titled.
+
+## Notes for reviewers
+
+None.
+
+## Changelog entries
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security

.github/workflows/code-quality.yml

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+name: Code Quality
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  code-quality:
+    if: github.event.pull_request.draft == false
+    uses: alleyinteractive/.github/.github/workflows/php-code-quality.yml@main
+    with:
+      php: 8.1

.github/workflows/coding-standards.yml

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+name: Coding Standards
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  coding-standards:
+    if: github.event.pull_request.draft == false
+    uses: alleyinteractive/.github/.github/workflows/php-coding-standards.yml@main
+    with:
+      php: 8.1

.github/workflows/unit-test.yml

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+name: Testing Suite
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  php-tests:
+    if: github.event.pull_request.draft == false
+    strategy:
+      matrix:
+        php: ["8.2", "8.1"]
+        wordpress: ["latest"]
+        multisite: [false, true]
+    uses: alleyinteractive/.github/.github/workflows/php-tests.yml@main
+    with:
+      php: ${{ matrix.php }}
+      wordpress: ${{ matrix.wordpress }}
+      multisite: ${{ matrix.multisite }}

.gitignore

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+vendor
+composer.lock
+.php_cs.cache
+.phpunit.result.cache
+.php-cs-fixer.cache

.php-cs-fixer.dist.php

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+<?php
+/**
+ * PHP-CS-Fixer configuration
+ *
+ * (c) Alley <info@alley.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @package wp-type-extensions
+ */
+
+$finder = PhpCsFixer\Finder::create()->in(
+	[
+		__DIR__ . '/src/',
+		__DIR__ . '/tests/',
+	]
+);
+
+$config = new PhpCsFixer\Config();
+$config->setRules(
+	[
+		'@PHP81Migration'       => true,
+		'method_argument_space' => false, // Enabled by '@PHP81Migration' but generates invalid spacing for WordPress.
+		'heredoc_indentation'   => false, // Enabled by '@PHP81Migration' but generates heredoc with syntax errors.
+
+		'final_class'                             => true,
+		'native_constant_invocation'              => true,
+		'native_function_casing'                  => true,
+		'native_function_invocation'              => true,
+		'native_function_type_declaration_casing' => true,
+	]
+);
+$config->setFinder( $finder );
+
+return $config;

CHANGELOG.md

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+# Changelog
+
+This library adheres to [Semantic Versioning](https://semver.org/) and [Keep a CHANGELOG](https://keepachangelog.com/en/1.0.0/).
+
+## Unreleased
+
+Nothing yet.
+
+## 0.1.0
+
+Initial release.