Add Joomla-aware development workflows and scripts

- Created extension packaging script
- Added PHPStan configuration for static analysis
- Added PHP_CodeSniffer configuration with Joomla standards
- Created Codeception testing framework setup
- Added PHP quality check workflow
- Added Joomla testing workflow with multiple versions
- Added staging deployment workflow
- Created comprehensive documentation
- Set up test directory structure with sample tests

Co-authored-by: jmiller-moko <230051081+jmiller-moko@users.noreply.github.com>

tests/_support/AcceptanceHelper.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Tests\Support;
+
+/**
+ * Acceptance test helper class
+ * 
+ * Provides helper methods for acceptance testing
+ */
+class AcceptanceHelper extends \Codeception\Module
+{
+    /**
+     * Custom helper methods can be added here
+     */
+}

tests/_support/UnitHelper.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Tests\Support;
+
+/**
+ * Unit test helper class
+ * 
+ * Provides helper methods for unit testing
+ */
+class UnitHelper extends \Codeception\Module
+{
+    /**
+     * Custom helper methods can be added here
+     */
+}