Basic side-by-side diff implementation (#43586)

Release Notes:

- N/A

---------

Co-authored-by: cameron <cameron.studdstreet@gmail.com>
Co-authored-by: Cameron <cameron@zed.dev>

crates/rope/src/point.rs

@@ -1,15 +1,22 @@
 use std::{
     cmp::Ordering,
+    fmt::{self, Debug},
     ops::{Add, AddAssign, Range, Sub},
 };
 
 /// A zero-indexed point in a text buffer consisting of a row and column.
-#[derive(Clone, Copy, Default, Eq, PartialEq, Debug, Hash)]
+#[derive(Clone, Copy, Default, Eq, PartialEq, Hash)]
 pub struct Point {
     pub row: u32,
     pub column: u32,
 }
 
+impl Debug for Point {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Point({}:{})", self.row, self.column)
+    }
+}
+
 impl Point {
     pub const MAX: Self = Self {
         row: u32::MAX,