This PR removes usages of `use gpui::*;` in the codebase (excluding
examples).
We should only use glob imports for `gpui::prelude`, and then import
everything else individually.
Release Notes:
- N/A
This PR renames the `ui_text_field` crate to `ui_input` to make it a bit
more generic.
We'll likely end up with multiple kinds of input components in this
crate.
Release Notes:
- N/A
