Left sidebar extension points

[kulmann]

Initial Checklist

• I understand this is a user story and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

User Story

• As a developer, I need more control over what to render where in the left sidebar so that I can utilize the left sidebar.

User Value

Left sidebar utilization

Acceptance Criteria

• left sidebar has multiple extension points
  • upper area:
    • floating action button (already in place)
    • nav items (already in place)
    • app.{appId}.sidebar-nav.main -> new extension point which accepts CustomComponent extensions
  • lower area:
    • app.{appId}.sidebar-nav.bottom -> new extension point which accepts CustomComponent extensions
    • version info (already in place)
  • use space between (flexbox) between upper and lower area
• dev docs are updated with the new extension points