Update project configuration and snapshot files

- Changed the default project file from `plugin.project.json` to `plugin.project.json5` in `build.rs`.
- Added new project configuration files in JSON5 format for various test cases, including `default.project.json5`, `client_in_folder`, `csv_bug_145`, and others.
- Updated snapshot files to reflect changes in instance structure and properties, ensuring consistency with the new project configurations.
- Removed unnecessary script and module instances from snapshot files to streamline the testing process.

src/snapshot_middleware/json.rs

@@ -122,7 +122,7 @@ mod test {
         )
         .unwrap();
         imfs.load_snapshot(
-            "/foo.meta.json",
+            "/foo.meta.json5",
             VfsSnapshot::file(
                 r#"{
                     "id": "manually specified"