Add support for auto-closing of JSX tags (#25681)

Closes #4271

Implemented by kicking of a task on the main thread at the end of
`Editor::handle_input` which waits for the buffer to be re-parsed before
checking if JSX tag completion possible based on the recent edits, and
if it is then it spawns a task on the background thread to generate the
edits to be auto-applied to the buffer

Release Notes:

- Added support for auto-closing of JSX tags

---------

Co-authored-by: Cole Miller <cole@zed.dev>
Co-authored-by: Max Brunsfeld <max@zed.dev>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Peter Tripp <peter@zed.dev>

crates/language/src/syntax_map.rs

@@ -121,9 +121,9 @@ impl SyntaxLayerContent {
 pub struct SyntaxLayer<'a> {
     /// The language for this layer.
     pub language: &'a Arc<Language>,
-    depth: usize,
+    pub(crate) depth: usize,
     tree: &'a Tree,
-    offset: (usize, tree_sitter::Point),
+    pub(crate) offset: (usize, tree_sitter::Point),
 }
 
 /// A layer of syntax highlighting. Like [SyntaxLayer], but holding
@@ -133,7 +133,7 @@ pub struct OwnedSyntaxLayer {
     /// The language for this layer.
     pub language: Arc<Language>,
     tree: tree_sitter::Tree,
-    offset: (usize, tree_sitter::Point),
+    pub offset: (usize, tree_sitter::Point),
 }
 
 #[derive(Debug, Clone)]