WIP: Add e8m0 datatype local ci #3
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Adding the OCP MX scale format `E8M0`, which has the following properties: * Unsigned format; * 8 exponent bits; * Exponent range from -127 to 127; * No zero and infinity; * Single NaN value (0xFF); `ml_dtypes` `float8_base` C++ class is extended to support floating point formats which are unsigned and with no zero (i.e. additional `kIsSigned` and `kHasZero` Traits properties). Base on these traits, `float8_e8m0_fnu` has been implemented using the existing functionalities (convert, unary/binary ops, ...). Float8 Python unit tests have been extended to be able to cover unsigned floating point formats.
`absltest.skip` is producing a warning with Python 3.12
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