[WIP] Rebuild AgentScope Studio

[pan-x-c]

Description

1. refactor AgentScope Studio and WebUI
2. merge AgentScope Workstation into AgentScope Studio
3. add distributed agent server manager into AgentScope Studio

Checklist

Please check the following items before code is ready to be reviewed.

• [ ] Code has passed all tests
• [ ] Docstrings have been added/updated in Google Style
• [ ] Documentation has been updated
• [ ] Code is ready for review