Introduce code generation (#2901)

![CleanShot 2023-08-28 at 12 24
36@2x](https://github.com/zed-industries/zed/assets/482957/f97cb399-1ac2-4fa9-94a7-137d1eec711c)


Release Notes:

- Added a new "Inline Assist" feature that lets you transform a
selection or generate new code at the cursor location by hitting
`ctrl-enter`.
ea17d1638eAntonio Scandurra committed on 8/30/2023, 12:58:22 PM· committed by GitHubparents7a1b300bf67d37
16 files changedLine totals unavailable