Add support for float8_e4m3fn and float8_e5m2 matmuls in HLO evalulator and XLA CPU
Add support for float8_e4m3fn and float8_e5m2 matmuls in HLO evalulator and XLA CPU

Reverts changelist 641225077

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/13062 from philipphack:u_fp8_windowed_einsum_xla 3ea415d65e47087bb077fa2b13e34c82a4dae87b
