feat: add code suggestions quick pick menu

Description

This MR adds a quick pick menu that can be triggered via the status bar icon.

This is the first MR in a series of MRs to refactor the status bar icon to open a quick pick menu.

In this iteration we display the status of code suggestions and a toggle to Enable/Disable code suggestions.

• Selecting the Status item will focus the active editor.
• Selecting the toggle will Enable/Disable code suggestions.

Related Issues

Contributes to #1438 (closed)

How has this been tested?

Apart from the tests that were added in this MR, I've also tested the changes locally.

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes