Switch LSP prompts to use a non-blocking toast (#8312)

This fixes a major degradation in usability that some users ran into.

Fixes https://github.com/zed-industries/zed/issues/8255 
Fixes https://github.com/zed-industries/zed/issues/8229

Release Notes:

- Switch from using platform prompts to toasts for LSP prompts.
([8255](https://github.com/zed-industries/zed/issues/8255),
[8229](https://github.com/zed-industries/zed/issues/8229))

<img width="583" alt="Screenshot 2024-02-23 at 2 40 05 PM"
src="https://github.com/zed-industries/zed/assets/2280405/1bfc027b-b7a8-4563-88b6-020e47869668">

Co-authored-by: Marshall <marshall@zed.dev>

crates/gpui_macros/src/style_helpers.rs

@@ -399,6 +399,8 @@ fn box_suffixes() -> Vec<(&'static str, TokenStream2, &'static str)> {
         ("72", quote! { rems(18.) }, "288px (18rem)"),
         ("80", quote! { rems(20.) }, "320px (20rem)"),
         ("96", quote! { rems(24.) }, "384px (24rem)"),
+        ("112", quote! { rems(28.) }, "448px (28rem)"),
+        ("128", quote! { rems(32.) }, "512px (32rem)"),
         ("auto", quote! { auto() }, "Auto"),
         ("px", quote! { px(1.) }, "1px"),
         ("full", quote! { relative(1.) }, "100%"),