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>

assets/settings/default.json

@@ -1298,6 +1298,11 @@
     // "semi": false,
     // "singleQuote": true
   },
+  // Settings for auto-closing of JSX tags.
+  "jsx_tag_auto_close": {
+    // // Whether to auto-close JSX tags.
+    // "enabled": true
+  },
   // LSP Specific settings.
   "lsp": {
     // Specify the LSP name as a key here.