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/project/src/project.rs

@@ -1513,6 +1513,7 @@ impl Project {
     pub fn delete_entry(
         &mut self,
         entry_id: ProjectEntryId,
+        trash: bool,
         cx: &mut ModelContext<Self>,
     ) -> Option<Task<Result<()>>> {
         let worktree = self.worktree_for_entry(entry_id, cx)?;
@@ -1521,7 +1522,10 @@ impl Project {
 
         if self.is_local() {
             worktree.update(cx, |worktree, cx| {
-                worktree.as_local_mut().unwrap().delete_entry(entry_id, cx)
+                worktree
+                    .as_local_mut()
+                    .unwrap()
+                    .delete_entry(entry_id, trash, cx)
             })
         } else {
             let client = self.client.clone();
@@ -1531,6 +1535,7 @@ impl Project {
                     .request(proto::DeleteProjectEntry {
                         project_id,
                         entry_id: entry_id.to_proto(),
+                        use_trash: trash,
                     })
                     .await?;
                 worktree
@@ -8341,6 +8346,7 @@ impl Project {
         mut cx: AsyncAppContext,
     ) -> Result<proto::ProjectEntryResponse> {
         let entry_id = ProjectEntryId::from_proto(envelope.payload.entry_id);
+        let trash = envelope.payload.use_trash;
 
         this.update(&mut cx, |_, cx| cx.emit(Event::DeletedEntry(entry_id)))?;
 
@@ -8354,7 +8360,7 @@ impl Project {
                 worktree
                     .as_local_mut()
                     .unwrap()
-                    .delete_entry(entry_id, cx)
+                    .delete_entry(entry_id, trash, cx)
                     .ok_or_else(|| anyhow!("invalid entry"))
             })??
             .await?;