Support new attribute shorthand

Add support for new attribute shorthand:

```just
[attr_key: "value"]
foo:
  echo "bar"
```
https://github.com/casey/just/blob/fa5770e71aa93402068ebc9e179e493fc94f8532/tests/attributes.rs#L202-L205

Author: mkatychev

.gitignore

@@ -12,6 +12,7 @@ build/
 .build/
 log.html
 *.wasm
+*.dylib
 fuzzer-out/
 
 # Fuzzer items

fuzzer/build-corpus.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
-"""Turn our tests into a corpus for the fuzzer (one test per file)
-"""
+"""Turn our tests into a corpus for the fuzzer (one test per file)"""
 
 from pathlib import Path
 import re

grammar.js

@@ -236,6 +236,7 @@ module.exports = grammar({
               field("argument", comma_sep1($.string)),
               ")",
             ),
+            seq($.identifier, ":", field("argument", $.string)),
           ),
         ),
         "]",

justfile

@@ -279,7 +279,7 @@ configure-tree-sitter:
 		j = json.load(f)
 		f.seek(0)
 
-		# Add ths tree-sitter-just directory to the config file
+		# Add the tree-sitter-just directory to the config file
 		parent_dir = os.path.dirname(r"{{ justfile_directory() }}")
 		j["parser-directories"].append(parent_dir)
 		json.dump(j, f)