Implement encoding and decoding for Windows-invalid characters in file names

- Added `encode_path_name` and `decode_path_name` functions to handle encoding and decoding of invalid characters.
- Updated `SyncbackRules` to include an option for encoding Windows-invalid characters during syncback.
- Modified `name_for_inst` to conditionally encode invalid characters based on the new option.
- Adjusted `ServeSession` and `InstanceContext` to support the new encoding feature.
- Updated tests and snapshots to reflect changes in encoding behavior.

src/serve_session.rs

@@ -106,8 +106,15 @@ impl ServeSession {
 
         let root_id = tree.get_root_id();
 
-        let instance_context =
+        let decode_windows_invalid_chars = root_project
+            .syncback_rules
+            .as_ref()
+            .map(|rules| rules.encode_windows_invalid_chars())
+            .unwrap_or(false);
+
+        let mut instance_context =
             InstanceContext::with_emit_legacy_scripts(root_project.emit_legacy_scripts);
+        instance_context.set_decode_windows_invalid_chars(decode_windows_invalid_chars);
 
         log::trace!("Generating snapshot of instances from VFS");
         let snapshot = snapshot_from_vfs(&instance_context, &vfs, start_path)?;