[Improvement]: Provide a completion snippet to generate a template for a test function

[nipunayf]

Description

When a user writes a test function, they typically have to write the function and then add the test annotation to it. It would be convenient to have a single completion snippet that automates these steps.

Describe your problem(s)

No response

Describe your solution(s)

The proposed solution closely resembles the one below, but it should include the necessary rename pop-ups.

Screen.Recording.2024-04-10.at.2.59.23.PM.mov

Related area

-> Compilation

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