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>

codeception.yml

@@ -0,0 +1,34 @@
+namespace: Tests
+paths:
+    tests: tests
+    output: tests/_output
+    data: tests/_data
+    support: tests/_support
+    envs: tests/_envs
+settings:
+    shuffle: false
+    lint: true
+    colors: true
+    memory_limit: 1024M
+coverage:
+    enabled: true
+    include:
+        - src/*
+    exclude:
+        - src/vendor/*
+        - src/media/*
+        - src/language/*
+extensions:
+    enabled:
+        - Codeception\Extension\RunFailed
+params:
+    - env
+modules:
+    config:
+        Db:
+            dsn: 'mysql:host=localhost;dbname=joomla_test'
+            user: 'root'
+            password: ''
+            dump: tests/_data/dump.sql
+            populate: true
+            cleanup: true