Fix item closing overly triggering save dialogues (#21374)

Closes https://github.com/zed-industries/zed/issues/12029

Allows to introspect project items inside items more deeply, checking
them for being dirty.
For that:
* renames `project::Item` into `project::ProjectItem`
* adds an `is_dirty(&self) -> bool` method to the renamed trait
* changes the closing logic to only care about dirty project items when
checking for save prompts conditions
* save prompts are raised only if the item is singleton without a
project path; or if the item has dirty project items that are not open
elsewhere

Release Notes:

- Fixed item closing overly triggering save dialogues

crates/editor/src/items.rs

@@ -22,8 +22,8 @@ use language::{
 use lsp::DiagnosticSeverity;
 use multi_buffer::AnchorRangeExt;
 use project::{
-    lsp_store::FormatTrigger, project_settings::ProjectSettings, search::SearchQuery, Item as _,
-    Project, ProjectPath,
+    lsp_store::FormatTrigger, project_settings::ProjectSettings, search::SearchQuery, Project,
+    ProjectItem as _, ProjectPath,
 };
 use rpc::proto::{self, update_view, PeerId};
 use settings::Settings;
@@ -665,7 +665,7 @@ impl Item for Editor {
     fn for_each_project_item(
         &self,
         cx: &AppContext,
-        f: &mut dyn FnMut(EntityId, &dyn project::Item),
+        f: &mut dyn FnMut(EntityId, &dyn project::ProjectItem),
     ) {
         self.buffer
             .read(cx)