Switch from delete file by default to trash file by default (#10875)

TODO:

- [x] Don't immediately seg fault
- [x] Implement for directories 
- [x] Add cmd-delete to remove files
- [ ] ~~Add setting for trash vs. delete~~ You can just use keybindings
to change the behavior.

fixes https://github.com/zed-industries/zed/issues/7228
fixes https://github.com/zed-industries/zed/issues/5094

Release Notes:

- Added a new `project_panel::Trash` action and changed the default
behavior for `backspace` and `delete` in the project panel to send a
file to the systems trash, instead of permanently deleting it
([#7228](https://github.com/zed-industries/zed/issues/7228),
[#5094](https://github.com/zed-industries/zed/issues/5094)). The
original behavior can be restored by adding the following section to
your keybindings:

```json5
[
// ...Other keybindings...
  {
    "context": "ProjectPanel",
    "bindings": {
        "backspace": "project_panel::Delete",
        "delete": "project_panel::Delete",
    }
  }
]

crates/worktree/src/worktree.rs

@@ -1335,6 +1335,7 @@ impl LocalWorktree {
     pub fn delete_entry(
         &self,
         entry_id: ProjectEntryId,
+        trash: bool,
         cx: &mut ModelContext<Worktree>,
     ) -> Option<Task<Result<()>>> {
         let entry = self.entry_for_id(entry_id)?.clone();
@@ -1343,16 +1344,31 @@ impl LocalWorktree {
 
         let delete = cx.background_executor().spawn(async move {
             if entry.is_file() {
-                fs.remove_file(&abs_path?, Default::default()).await?;
+                if trash {
+                    fs.trash_file(&abs_path?, Default::default()).await?;
+                } else {
+                    fs.remove_file(&abs_path?, Default::default()).await?;
+                }
             } else {
-                fs.remove_dir(
-                    &abs_path?,
-                    RemoveOptions {
-                        recursive: true,
-                        ignore_if_not_exists: false,
-                    },
-                )
-                .await?;
+                if trash {
+                    fs.trash_dir(
+                        &abs_path?,
+                        RemoveOptions {
+                            recursive: true,
+                            ignore_if_not_exists: false,
+                        },
+                    )
+                    .await?;
+                } else {
+                    fs.remove_dir(
+                        &abs_path?,
+                        RemoveOptions {
+                            recursive: true,
+                            ignore_if_not_exists: false,
+                        },
+                    )
+                    .await?;
+                }
             }
             anyhow::Ok(entry.path)
         });

crates/worktree/src/worktree_tests.rs

@@ -1764,7 +1764,7 @@ fn randomly_mutate_worktree(
     match rng.gen_range(0_u32..100) {
         0..=33 if entry.path.as_ref() != Path::new("") => {
             log::info!("deleting entry {:?} ({})", entry.path, entry.id.0);
-            worktree.delete_entry(entry.id, cx).unwrap()
+            worktree.delete_entry(entry.id, false, cx).unwrap()
         }
         ..=66 if entry.path.as_ref() != Path::new("") => {
             let other_entry = snapshot.entries(false).choose(rng).unwrap();