Autocomplete for pre-build and imported libraries.

[ant0x64]

I have checked the following:

• [X] I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

It would be awesome to have autocomplete for custom and imported libraries in the Scripts and Tests tabs, including hints for possible imported functions from the required library. This feature would greatly benefit those who are not highly skilled in writing code.

Moreover, currently, even pre-built libraries (e.g., Chai) don't have this feature.

Mockups or Images of the feature