Remove useless file

[Adorable-Qin]

✨ Description

/modules/encoder/conv_encoder.py This file is a deprecated file left over from the old implementation. It may cause unstable state as it contains invalid reference, so it is removed.

🚧 Related Issues

Issue 178

👨‍💻 Changes Proposed

• Remove conv_encoder.py

🧑‍🤝‍🧑 Who Can Review?

@RMSnow

🛠 TODO

• Nah.

✅ Checklist

• [x] Code has been reviewed
• [ ] Code complies with the project's code standards and best practices
• [x] Code has passed all tests
• [x] Code does not affect the normal use of existing features
• [ ] Code has been commented properly
• [ ] Documentation has been updated (if applicable)
• [ ] Demo/checkpoint has been attached (if applicable)