highfive float precision noisey warnings

[PhilipDeegan]

By default, PHARE builds with only single precision floats being stored in HDF5
This implies a conversion from runtime float64 data,. which highfive warns about.

More info on highfive issue here BlueBrain/HighFive#910

short term, we can do something with the env var HIGHFIVE_LOG_LEVEL_ERROR to silence all warnings
longer term we can create a custom logger which filters warnings we don't care about