Fix logging when using as library

When unblob is used as a library, the structlog may already be
configured as the end-user likes. In this case:
    1) We don't need to configure it again with our CLI config.
    2) We still need to apply the "pretty_print_types" processor to the
processor chain, so our types will be printed nicely.
We add this to the begining of the processor chain, because
    - It is lightweight
    - At the end of the processor chain must be some render, which will
convert the whole event_dict to str, and usually before the renderer,
there are various amount of error / exception formatters.

unblob/logging.py

@@ -53,6 +53,13 @@ def convert_type(logger, method_name: str, event_dict: structlog.types.EventDict
 
 
 def configure_logger(verbose: bool, extract_root: Path):
+    if structlog.is_configured:
+        # If used as a library, with already configured structlog, we still need our types to be prettyly printed
+        processors = structlog.get_config().get("processors", [])
+        processors.insert(0, pretty_print_types(extract_root))
+        structlog.configure(processors=processors)
+        return
+
     log_level = logging.DEBUG if verbose else logging.INFO
     processors = [
         structlog.stdlib.add_log_level,