Add session tab list view to console pane

[dhruvisompura]

Create a tab list component that displays active sessions in the order they are created. The tab list does not need to support drag and drop reordering in this pass.

Each tab will display the following information in order:

• session state (idle/busy/shutdown)
• language icon
• session name
  • Will require a global counter tacked on the end of the session name to differentiate between duplicate sessions

To change the active session, a user can click on a tab from the console tab list. The console tab list will use the tab pattern documented here: https://www.w3.org/WAI/ARIA/apg/patterns/tabs/examples/tabs-automatic/

Testing:

• Verify shutdown behavior for the active session
  • Verify the status indicator shows disconnected
• Verify shutdown behavior for more than one active console session
  • Ensure the status indicator for the correct session changes
• Verify the tab list is accessible (aria attributes, focus state, and keyboard navigation)
• Verify that active session changes for editor, and variables panes
  • Verify variables pane switches context to new active session and displays the variables for the new active session
• Verify changing variables pane session does not change primary active session for console/editor.
  • Note: This behavior has had a regression and can be skipped for testing until fixed.
• Verify there is an output channel for the session
• Verify the status indicator shows busy when code is executing for a session
• Verify the status indicator shows idle