Introduce DisplayRow, MultiBufferRow newtypes and BufferRow type alias (#11656)

Part of https://github.com/zed-industries/zed/issues/8081

To avoid confusion and bugs when converting between various row `u32`'s,
use different types for each.
Further PRs should split `Point` into buffer and multi buffer variants
and make the code more readable.

Release Notes:

- N/A

---------

Co-authored-by: Piotr <piotr@zed.dev>

crates/vim/src/normal/paste.rs

@@ -2,6 +2,7 @@ use std::cmp;
 
 use editor::{
     display_map::ToDisplayPoint, movement, scroll::Autoscroll, ClipboardSelection, DisplayPoint,
+    RowExt,
 };
 use gpui::{impl_actions, AppContext, ViewContext};
 use language::{Bias, SelectionGoal};
@@ -99,13 +100,13 @@ fn paste(_: &mut Workspace, action: &Paste, cx: &mut ViewContext<Workspace>) {
                         .map(|selection| cmp::min(selection.start.column(), selection.end.column()))
                         .min()
                         .unwrap();
-                    let mut row = current_selections.last().unwrap().end.row() + 1;
+                    let mut row = current_selections.last().unwrap().end.row().next_row();
                     while i < clipboard_selections.len() {
                         let cursor =
                             display_map.clip_point(DisplayPoint::new(row, left), Bias::Left);
                         selections_to_process.push((cursor..cursor, false));
                         i += 1;
-                        row += 1;
+                        row.0 += 1;
                     }
                 }