(BE) Generate slug for workspace and document

[devleejb]

What would you like to be added:

To improve the usability of Document and Workspace URLs, a slug is generated and recorded in the database. This task involves the following actions:

• Generate a slug and record it in the database.
• Update the slug when the title is modified.
• Implement search logic using the slug for Document and Workspace.

Why is this needed:

Essential for Improving User URL Acces

Additional Information:

[devleejb]

API Spec is updated for slug.

#27

[devleejb]

Database Schema is updated for slug.

#6