Move DisplayDiffHunk into hunk_diff module (#18307)

Release Notes:

- N/A

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

crates/editor/src/editor.rs

@@ -71,7 +71,6 @@ pub use element::{
 use futures::{future, FutureExt};
 use fuzzy::{StringMatch, StringMatchCandidate};
 use git::blame::GitBlame;
-use git::diff_hunk_to_display;
 use gpui::{
     div, impl_actions, point, prelude::*, px, relative, size, uniform_list, Action, AnyElement,
     AppContext, AsyncWindowContext, AvailableSpace, BackgroundExecutor, Bounds, ClipboardEntry,
@@ -84,8 +83,8 @@ use gpui::{
 };
 use highlight_matching_bracket::refresh_matching_bracket_highlights;
 use hover_popover::{hide_hover, HoverState};
-use hunk_diff::ExpandedHunks;
 pub(crate) use hunk_diff::HoveredHunk;
+use hunk_diff::{diff_hunk_to_display, ExpandedHunks};
 use indent_guides::ActiveIndentGuidesState;
 use inlay_hint_cache::{InlayHintCache, InlaySplice, InvalidationStrategy};
 pub use inline_completion_provider::*;