Add predefined datatypes for FP8 formats

[jhendersonHDF]

Adds predefined datatypes for FP8 data in E4M3 and E5M2 formats

Does not add support for any native FP8 types; datatype conversions are performed in software

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Important

Add predefined datatypes for FP8 formats (E4M3 and E5M2) to HDF5, with software-based conversions and updated tests and documentation.

• Behavior:
  • Adds predefined datatypes H5T_FLOAT_F8E4M3 and H5T_FLOAT_F8E5M2 for FP8 formats in H5Tpublic.h.
  • Updates H5T.c to initialize these new FP8 datatypes.
  • Modifies h5tools_type.c and h5util.c to handle FP8 datatype conversions.
  • Updates HDF5Constants.java to include new FP8 datatypes.
• Tests:
  • Adds test cases for FP8 datatypes in test_lite.c, dt_arith.c, dtypes.c, and ntypes.c.
  • Updates h5dumpgentest.c to generate test files for FP8 datatypes.
• Documentation:
  • Updates CHANGELOG.md to mention known issues with FP8 datatype conversions.
  • Adds comments in H5Tpublic.h regarding the limitations of FP8 datatype conversions.

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