Add command detection to git import flow

[wonderwhy-er]

I already added this for folder import before #426
Now extracted and reused for git import as well

Here is video:

2024-12-08.12-21-05.mp4

Purpose:
Removes couple of steps, especially for non developers, in seeing preview of loaded project.

Way it works is that it checks if there is package.json file, reads it, checks for commands, runs install and tries to run commands
https://github.com/coleam00/bolt.new-any-llm/pull/589/files#diff-6974fdf2657c6325130ca11f89326ffe1297cb97971c3c377e712387ce45cec5R30

In case there is no package.json but there is index.html it does npx serve

If nothing is found it just adds message that standard ways to run project were not found and proposes to send request to AI to analyse how to run the project.

[dustinwloring1988]

@wonderwhy-er Looks nice, trying now

[dustinwloring1988]

Works great on Windows and Linux