- change ConfigRoot to use RootBase enum for different root types (Crate, Home, Root, None)
- add full_path method to resolve the full path based on RootBase and path
- update tests to use full_path to string conversion for assertions
- introduce regex-based parsing for config root strings
- support 'h', 'r', and 'c' prefixes for home, root, and crate paths
- add tests for parsing different config root types
- introduce ConfigRoot enum to represent different configuration file locations
- implement Display trait for ConfigRoot to provide string representation
- add parse method to determine ConfigRoot type based on prefix (h, r, c)
