import apply_symmetry_to_xyz_atomwise in inference_sampler

[Wenzhao-protein]

This pull request introduces new imports to the inference_sampler.py file, preparing the module to support symmetry operations during inference. These changes set up the codebase for future enhancements related to symmetry handling.

• Added imports for FIXED_ENTITY_ID and FIXED_TRANSFORM_ID from atom_array, and apply_symmetry_to_xyz_atomwise from symmetry_utils to enable symmetry-related functionality in inference workflows.