Update dev container

[SimonYansenZhao]

Description

Dev containers and GitHub Codespaces provide more convenient development environments for Recommenders users. But the dev container configuration in the repo is not working and contains many deprecated settings. This PR modifies the dev container configuration including the following updates:

• OS: Debian 12 $\to$ Ubuntu 24.04
• Python: 3.7 $\to$ 3.10
• Java: OpenJDK 8 $\to$ OpenJDK 21
• Use Conda for env management
• Install recommended VS Code extensions for Python
• Add several settings for Python and Pytest
• Specify minimum machine specification

Related Issues

References

Checklist:

• [X] I have followed the contribution guidelines and code style for this project.
• [ ] I have added tests covering my contributions.
• [ ] I have updated the documentation accordingly.
• [x] I have signed the commits, e.g. git commit -s -m "your commit message".
• [X] This PR is being made to staging branch AND NOT TO main branch.