[LigaAI] Add LigaAI issue sidebar menu and related views

What does this MR do and why?

Related issue: #2799 (closed)

This is the 3rd part of LigaAI integration MR.

• Display LigaAI issues menu sidebar
• Add issues index page
• Add issue details page

Screenshots or screen recordings

Index page

Details page

/cc @chaomao