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/snapshot_middleware/dir.rs

@@ -172,6 +172,11 @@ pub fn syncback_dir_no_meta<'sync>(
                 );
                 continue;
             }
+            // Skip instances matching ignoreTrees
+            if snapshot.should_ignore_tree(*new_child_ref) {
+                old_child_map.remove(new_child.name.as_str());
+                continue;
+            }
             if let Some(old_child) = old_child_map.remove(new_child.name.as_str()) {
                 if old_child.metadata().relevant_paths.is_empty() {
                     log::debug!(
@@ -223,6 +228,10 @@ pub fn syncback_dir_no_meta<'sync>(
                 );
                 continue;
             }
+            // Skip instances matching ignoreTrees
+            if snapshot.should_ignore_tree(*new_child_ref) {
+                continue;
+            }
             children.push(snapshot.with_joined_path(*new_child_ref, None)?);
         }
     }