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/unit.suite.yml

@@ -0,0 +1,8 @@
+# Codeception Test Suite Configuration
+
+actor: UnitTester
+modules:
+    enabled:
+        - Asserts
+        - \Tests\Support\UnitHelper
+step_decorators: ~