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/acceptance.suite.yml

@@ -0,0 +1,14 @@
+# Codeception Test Suite Configuration
+
+actor: AcceptanceTester
+modules:
+    enabled:
+        - WebDriver:
+            url: http://localhost
+            browser: chrome
+            window_size: 1920x1080
+            capabilities:
+                chromeOptions:
+                    args: ["--headless", "--disable-gpu", "--no-sandbox"]
+        - \Tests\Support\AcceptanceHelper
+step_decorators: ~