Support the .npy File

[teweitsai]

ParamReader class needs to support the .npy file. It should be able to transfer the yaml file to the npy file and read it. The Sconscript should be updated as well to build the specific files from yaml to npy in the scons process (this should happen in the ts_ofc module). The sensitivity matrix and bending mode should use the npy file to decrease the reading time.
This is a related issue of lsst-ts/ts_phosim/#23.