Add a way to navigate between changes (#28891)

Closes https://github.com/zed-industries/zed/issues/19731

Adds `editor::GoToPreviousChange` and `editor::GoToNextChange` that work
the same as `vim::ChangeListOlder` and `vim::ChangeListNewer` as the
common logic was extracted and reused.

Release Notes:

- Added a way to navigate between changes with
`editor::GoToPreviousChange` and `editor::GoToNextChange`

crates/vim/src/vim.rs

@@ -323,8 +323,6 @@ pub(crate) struct Vim {
     pub(crate) replacements: Vec<(Range<editor::Anchor>, String)>,
 
     pub(crate) stored_visual_mode: Option<(Mode, Vec<bool>)>,
-    pub(crate) change_list: Vec<Vec<Anchor>>,
-    pub(crate) change_list_position: Option<usize>,
 
     pub(crate) current_tx: Option<TransactionId>,
     pub(crate) current_anchor: Option<Selection<Anchor>>,
@@ -370,8 +368,6 @@ impl Vim {
             replacements: Vec::new(),
 
             stored_visual_mode: None,
-            change_list: Vec::new(),
-            change_list_position: None,
             current_tx: None,
             current_anchor: None,
             undo_modes: HashMap::default(),