Refactor GeoAnimatorManager to integrate RawSequentialBuffer and enhance transform handling

- Introduced RawSequentialBuffer to manage overlapping I/O and transform computations.
- Updated _setup_reader to enforce TransformSpec type for transform options.
- Enhanced error handling for invalid transform specifications.
- Modified BufferedSlicingReader initialization to include adaptive chunk sizing parameters.
- Added comprehensive tests for RawSequentialBuffer functionality and performance.
- Updated tests for StreamingTransformedSlicingReader to utilize TransformSpec for transformations.
- Ensured that vmin/vmax properties are inherited correctly from inner readers.

Author: dwr-psandhu