feat: add main_sync wrapper for asyncio compatibility

Refactored the main execution pathway to introduce a `main_sync` function that wraps the existing asynchronous `main` function, facilitating compatibility with environments that necessitate or prefer synchronous execution. This change enhances the bot's flexibility in various deployment scenarios without altering the core asynchronous functionality.

In addition, expanded the exception handling in `get_version` to catch all exceptions instead of limiting to `DistributionNotFound`. This broadens the robustness of version retrieval, ensuring the application can gracefully handle unexpected issues during version lookup.

Whitespace adjustments improve code readability by clearly separating function definitions.

These adjustments contribute to the maintainability and operability of the application, allowing for broader usage contexts and easier integration into diverse environments.

src/gptbot/__main__.py

@@ -7,16 +7,19 @@ import signal
 import asyncio
 import importlib.metadata
 
+
 def sigterm_handler(_signo, _stack_frame):
     exit()
 
+
 def get_version():
     try:
         package_version = importlib.metadata.version("matrix_gptbot")
-    except pkg_resources.DistributionNotFound:
+    except Exception:
         return None
     return package_version
 
+
 async def main():
     # Parse command line arguments
     parser = ArgumentParser()
@@ -59,5 +62,9 @@ async def main():
         print("Received SIGTERM - exiting...")
 
 
+def main_sync():
+    asyncio.run(main())
+
+
 if __name__ == "__main__":
-    asyncio.get_event_loop().run_until_complete(main())
+    main_sync()