validateCollectionPath(collectionPath: string): void;
CollectionPath must be NULL string or paths that match the following conditions:
- CollectionPath can include paths separated by slashes.
- A directory name in paths allows Unicode characters except for OS reserved filenames and the following characters: \< \> : " | ? * \\0
- **It is recommended to use ASCII characters and case-insensitive names for cross-platform.**
- A directory name in paths cannot end with a period or a white space.
- A directory name in paths does not allow '.' and '..'.
- CollectionPath cannot start with a slash.
- Trailing slash could be omitted. e.g.) 'pages' and 'pages/' show the same CollectionPath.