Devicetree DTS and YAML format improvements (#492)

* **DevicetreeCompiler**
  * Binding properties now support default values.
  * Compiler returns meaningful exit codes and reports errors more clearly.
  * Stronger validation of device configurations with unified error handling.
  * Added integration tests and a dedicated Devicetree test workflow.

* **Changes**
  * Platform binding schemas updated: some fields made required, others gained explicit defaults.
  * Many device-tree files simplified by removing unused/placeholder pin and transfer-size entries.

* **Documentation**
  * Removed several outdated TODO items.

Buildscripts/DevicetreeCompiler/source/binding_parser.py

@@ -44,6 +44,7 @@ def parse_binding(file_path: str, binding_dirs: list[str]) -> Binding:
             type=details.get('type', 'unknown'),
             required=details.get('required', False),
             description=details.get('description', '').strip(),
+            default=details.get('default', None),
         )
         properties_dict[name] = prop
     filename = os.path.basename(file_path)