Enter Sourcegraph search query directly from VS Code command menu

Created by: jjinnii

Feature request description

Ability to enter a search query from VS Code command menu. CMD + Shift + P -> Sourcegraph: search query.

As a user, if I would like to perform a Sourcegraph search but do not already have a Sourcegraph search tab open, it is an extra step for me to click on the Sourcegraph icon in the toolbar before being able to perform a search. VS Code users are also accustomed to using VS Code commands to quickly perform tasks (especially for extensions), and this may be a gut first step for many of our users.

Additional context

This is taken from internal feedback.

Technical considerations

Are we able to implement auto complete in the VS Code command menu as a user completes a search?