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 data in E4M3 and E5M2 formats with software-based conversions.

• Behavior:
  • Adds predefined datatypes H5T_FLOAT_F8E4M3 and H5T_FLOAT_F8E5M2 for FP8 data in E4M3 and E5M2 formats.
  • Conversions for FP8 datatypes are performed in software, not natively.
• Files:
  • Updates H5PredType.cpp, H5PredType.h, and H5_f.c to include new FP8 datatypes.
  • Modifies H5LTanalyze.c, H5LTparse.c, and H5LTparse.y to handle new FP8 tokens.
  • Adds tests for FP8 datatypes in test_lite.c, H5_api_dataset_test.c, and dt_arith.c.
• Misc:
  • Updates CHANGELOG.md to document new FP8 datatypes.
  • Adds FP8 datatype handling in HDF5Constants.java and h5util.c.

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[ellipsis-dev]

Typo: The comment indicates 'Datatype for FP8 E4ME', but based on the H5T_FLOAT_F8E4M3 identifier, it should likely be 'FP8 E4M3'.

Suggested change

	H5T_t *f8_e4m3_dt = NULL; /* Datatype for FP8 E4ME */
	H5T_t *f8_e4m3_dt = NULL; /* Datatype for FP8 E4M3 */