Do not reload installed packages on file change

[rickythefox]

Closes #790 .

The issue was present when the venv was created in the same dir as the project using chainlit. On reload the code that was supposed to clear the modules related to the app from sys.modules also cleared chainlit itself which led to a reload and a new config object being initialized when config.py module was loaded. The socket.py module still had the reference to the old config module though, which resulted in reload failing. The lesson here is - module reloading in python is HARD and should really not be attempted. ;)

The fix checks where the modules are installed (venv or regular installation) and prevents their reload. This fixes all cases EXCEPT the hello.py in the chainlit repo - as the chainlit code is in the same dir as the demo file it's imporsible to say what's what. A possible fix would be to move hello.py to a subdir.

[willydouhard]

This looks awesome! Going to do a bit of manual testing before merging. Thanks!

[rickythefox]

So did you get this to work? Any corner cases I need to take into account?

[tpatel]

Thanks for your contribution ✨

I couldn't replicate the file watcher issue, so I can't be sure it's fixing all the issues mentioned, but the explanation makes sense and I see no bad things that could come form this!