Add git blame (#8889)

This adds a new action to the editor: `editor: toggle git blame`. When
used it turns on a sidebar containing `git blame` information for the
currently open buffer.

The git blame information is updated when the buffer changes. It handles
additions, deletions, modifications, changes to the underlying git data
(new commits, changed commits, ...), file saves. It also handles folding
and wrapping lines correctly.

When the user hovers over a commit, a tooltip displays information for
the commit that introduced the line. If the repository has a remote with
the name `origin` configured, then clicking on a blame entry opens the
permalink to the commit on the code host.

Users can right-click on a blame entry to get a context menu which
allows them to copy the SHA of the commit.

The feature also works on shared projects, e.g. when collaborating a
peer can request `git blame` data.

As of this PR, Zed now comes bundled with a `git` binary so that users
don't have to have `git` installed locally to use this feature.

### Screenshots

![screenshot-2024-03-28-13 57
43@2x](https://github.com/zed-industries/zed/assets/1185253/ee8ec55d-3b5e-4d63-a85a-852da914f5ba)

![screenshot-2024-03-28-14 01
23@2x](https://github.com/zed-industries/zed/assets/1185253/2ba8efd7-e887-4076-a87a-587a732b9e9a)
![screenshot-2024-03-28-14 01
32@2x](https://github.com/zed-industries/zed/assets/1185253/496f4a06-b189-4881-b427-2289ae6e6075)

### TODOs

- [x] Bundling `git` binary

### Release Notes

Release Notes:

- Added `editor: toggle git blame` command that toggles a sidebar with
git blame information for the current buffer.

---------

Co-authored-by: Antonio <antonio@zed.dev>
Co-authored-by: Piotr <piotr@zed.dev>
Co-authored-by: Bennet <bennetbo@gmx.de>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/fs/src/fs.rs

@@ -9,7 +9,7 @@ use async_tar::Archive;
 use futures::{future::BoxFuture, AsyncRead, Stream, StreamExt};
 use git2::Repository as LibGitRepository;
 use parking_lot::Mutex;
-use repository::GitRepository;
+use repository::{GitRepository, RealGitRepository};
 use rope::Rope;
 #[cfg(any(test, feature = "test-support"))]
 use smol::io::AsyncReadExt;
@@ -111,7 +111,16 @@ pub struct Metadata {
     pub is_dir: bool,
 }
 
-pub struct RealFs;
+#[derive(Default)]
+pub struct RealFs {
+    git_binary_path: Option<PathBuf>,
+}
+
+impl RealFs {
+    pub fn new(git_binary_path: Option<PathBuf>) -> Self {
+        Self { git_binary_path }
+    }
+}
 
 #[async_trait::async_trait]
 impl Fs for RealFs {
@@ -431,7 +440,10 @@ impl Fs for RealFs {
         LibGitRepository::open(dotgit_path)
             .log_err()
             .map::<Arc<Mutex<dyn GitRepository>>, _>(|libgit_repository| {
-                Arc::new(Mutex::new(libgit_repository))
+                Arc::new(Mutex::new(RealGitRepository::new(
+                    libgit_repository,
+                    self.git_binary_path.clone(),
+                )))
             })
     }
 
@@ -824,6 +836,17 @@ impl FakeFs {
         });
     }
 
+    pub fn set_blame_for_repo(&self, dot_git: &Path, blames: Vec<(&Path, git::blame::Blame)>) {
+        self.with_git_state(dot_git, true, |state| {
+            state.blames.clear();
+            state.blames.extend(
+                blames
+                    .into_iter()
+                    .map(|(path, blame)| (path.to_path_buf(), blame)),
+            );
+        });
+    }
+
     pub fn set_status_for_repo_via_working_copy_change(
         &self,
         dot_git: &Path,