Add more test cases for unquoted strings in objects (#1054)

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> [!IMPORTANT]
> Add test case for handling unquoted strings with spaces in JSON-like
objects in `test_class.rs`.
> 
>   - **Tests**:
> - Add `test_string_field_with_spaces` in `test_class.rs` to handle
unquoted strings with spaces in JSON-like objects.
> - Validates deserialization of strings with spaces and newline
characters.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for abeceb6. It will automatically
update as commits are pushed.</sup>

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engine/baml-lib/jsonish/src/tests/test_class.rs

@@ -1201,3 +1201,27 @@ test_deserializer!(
   FieldType::Class("Foo".to_string()),
   {"a": "", "b": "", "res": []}
 );
+
+test_deserializer!(
+  test_string_field_with_spaces,
+  r#"
+  class Foo {
+    a string
+    b string
+    res string[]
+  }
+  "#,
+  r#"{
+    a: Hi friends!,
+    b: hey world lets do something kinda cool
+    so that we can test this out,
+    res: [hello,
+     world]
+  }"#,
+  FieldType::Class("Foo".to_string()),
+  {
+    "a": "Hi friends!",
+    "b": "hey world lets do something kinda cool\n    so that we can test this out",
+    "res": ["hello", "world"]
+  }
+);