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 FP8 datatypes (E4M3 and E5M2) to HDF5 with software conversion support and update tests and documentation.

• Datatypes:
  • Add FLOAT_F8E4M3 and FLOAT_F8E5M2 to H5PredType.cpp and H5PredType.h.
  • Update H5T.c and H5Tpublic.h to define FP8 E4M3 and E5M2 formats.
• Conversion:
  • Modify h5util.c and H5Tnative.c to handle FP8 conversions in software.
  • Update H5LTparse.y and H5LTparse.c to include FP8 tokens.
• Testing:
  • Add tests for FP8 datatypes in test_lite.c, dt_arith.c, and dtypes.c.
  • Update h5dumpgentest.c to generate test files for FP8.
• Documentation:
  • Update CHANGELOG.md to mention FP8 datatype limitations.
  • Add FP8 descriptions to predefinedDatatypes.dox.

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