Blosc Transform

Created by: ax3l

Hi,

opening since I did not find an issue on it. Are we still planning to add a blosc transform again to ADIOS2?

We are using it all the time in PIConGPU as parallel compressor (https://arxiv.org/abs/1706.00522) and like the modern methods it implements as a meta-compressor (e.g. zstd and bitshuffle pre-conditioners) as well.

I think to remember we talked last time if we want to implement (thread/OpenMP) parallelization of transformation steps in general.