This PR adds command palette actions for:

- `sort lines case sensitive`
- `sort lines case insensitive`
- `reverse lines`
- `shuffle lines`

Closes out:

- https://github.com/zed-industries/community/issues/658

and partially closing out:

- https://github.com/zed-industries/community/issues/57 (which is
currently a top-ranked issue)

There are issues with dedupe lines and I didn't try to tackle converting
variable names between different conventions. I'll likely close out 57
with a note to just upvote the remaining individual issues

Release Notes:

- added command palette actions for `sort lines case sensitive`, `sort
lines case insensitive`, `reverse lines`, and`shuffle lines`
(([#57](https://github.com/zed-industries/community/issues/57)),
([#658](https://github.com/zed-industries/community/issues/658)))