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/languages/src/javascript/config.toml

@@ -20,6 +20,12 @@ tab_size = 2
 scope_opt_in_language_servers = ["tailwindcss-language-server", "emmet-language-server"]
 prettier_parser_name = "babel"
 
+[jsx_tag_auto_close]
+open_tag_node_name = "jsx_opening_element"
+close_tag_node_name = "jsx_closing_element"
+jsx_element_node_name = "jsx_element"
+tag_name_node_name = "identifier"
+
 [overrides.element]
 line_comments = { remove = true }
 block_comment = ["{/* ", " */}"]