[Docker Extensions] Add Search to Marketplace

[amyb12345]

Tell us about your request
Add search capabilities to Docker Extension Marketplace

Which service(s) is this request for?
Docker Extensions

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
As the list of extensions grows, we want to provide developers with a way to find extensions. We also want to allow developers to search by keywords to find extensions to help solve daily challenges.

Are you currently working around the issue?
Scrolling through the list is the only available option right now.

Additional context
N/A

[amyb12345]

Released in Docker Desktop 4.12!