add pigz compressor

[cclecle]

pigz is a fast and efficient compression algorithm.

Comparison show that it is the best algorithm when throughput matter :

source

DAB can be used for continuous integration, and it that context speed matter (and so throughput !)

This PR add 2 pigz compressor backed: one with default coinifiguration and one other targeting speed.

[sterzy]

Hi @cclecle,

thanks for your contribution! However, we do not allow for submissions through GitHub. Please consider submitting your changes via the mailing list ^1 after signing the Harmony CLA ^2. You can also read more about how to contribute in our Developer Documentation ^3.