Remove diagnostics

Diagnostics removed for the moment to eliminate Home Assistant warning:

WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to import_module with args ('custom_components.hal.diagnostics',) in /usr/src/homeassistant/homeassistant/loader.py, line 1330: return importlib.import_module(f"{self.pkg_path}.{platform_name}") inside the event loop; This is causing stability issues. Please create a bug report at https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue

Full Changelog: v.0.0.8...v.0.0.9