Enabled INFO logging by default

The `LoggingConfig` will now create a default root logger that has
`INFO` enabled and `INFO` is passed to `logging.basicConfig()`, so user
can at least see `INFO` messages during initialization.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/sdk/config/_logging_actor.py

@@ -46,7 +46,7 @@ class LoggingConfig:
     """A configuration for the logging system."""
 
     root_logger: LoggerConfig = field(
-        default_factory=LoggerConfig,
+        default_factory=lambda: LoggerConfig(level="INFO"),
         metadata={
             "metadata": {
                 "description": "Default default configuration for all loggers.",
@@ -147,6 +147,7 @@ def __init__(
         logging.basicConfig(
             format=log_format,
             datefmt=log_datefmt,
+            level=logging.INFO,
         )
         self._update_logging(self._current_config)