Time out the code discovery phase of cnd create

[rberrelleza]

Describe the bug
On very large repos, the code analysis we perform as part of cnd create (to detect the main language) can take a very long time. Yesterday, on a friend's repo (an ML-based app full of data and models) it would take minutes. And there wasn't any output while this was happening.

Expected behavior
I think that the create job should always be almost instantaneous. We should maybe limit the number of files we parse, or have a 1s timeout, and then do our best guess based on the information collected.

Desktop (please complete the following information):

• OS: macOS
• Version 0.4.4