Enhance ZON parser to support tuples and update documentation

- Modify parser to handle ZON tuples (`.{ 1, 2, 3 }`) as arrays
- Update README with more detailed explanation of ZON tuple syntax
- Add multiple example ZON files demonstrating tuple usage
- Implement tuple parsing in `parser.py`
- Add test case for tuple parsing

examples/example.zon

@@ -7,5 +7,5 @@
             .hash = "abcdef123456",
         },
     },
-    .tags = .["tag1", "tag2"],
-}
+    .tags = .{ "tag1", "tag2" },
+}