Adds new subfiling API H5FDsubfiling_get_file_mapping()

[brtnfld]

Maps logical file to physical subfiles: When HDF5 uses the subfiling VFD, a single logical HDF5 file is actually split across multiple physical subfiles stored on different nodes. The new API returns subfile paths, providing the complete list of subfile names/paths that make up the logical file for a given MPI rank. This enables file reconstruction by using tools like h5fuse to recombine the subfiles into a single HDF5 file.

Closes #5120

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Important

Adds H5FDsubfiling_get_file_mapping() API to map logical HDF5 files to physical subfiles, with Fortran support and comprehensive testing.

• New API:
  • Adds H5FDsubfiling_get_file_mapping() in H5FDsubfiling.c to retrieve subfile paths for a logical HDF5 file.
  • Updates Fortran interface in H5VFDff.F90 to include h5fdsubfiling_get_file_mapping_f().
• Testing:
  • Adds tests in t_subfiling_vfd.c for H5FDsubfiling_get_file_mapping() covering various scenarios including error conditions and I/O operations.
• Utilities:
  • Updates h5fuse.in to support a list of subfiles for processing with a new -l option.

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[ellipsis-dev]

Typo noticed in the documentation: "H5VL function" appears instead of "H5VFD function". Considering this module provides the Fortran interface for H5VFD, please update the comment accordingly.

Suggested change

	! If you add a new H5VL function you must add the function name to the
	! If you add a new H5VFD function you must add the function name to the