[IDE] Trigger context menu via button or typing +

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Problem to solve

Reduce the friction around adding a context source by switching from typing /include to typing + or clicking on a button.

See gitlab-vscode-extension#1840 (moved) for more details on the problem and user feedback.

Why it's important

Users will frequently add context sources when using Duo in the IDE.

Proposal

1. Add a button (+ Context) that triggers the menu
2. Trigger the menu if the user types + (or other symbol like @, see #555860)

Example

Important links

• Figma
• Prototype (to illustrate the concept, not a 1:1 spec)