Add momentum MC info to hits

[valerpia]

This is needed as there is no 1:1 correspondecy between edepsim Trajectory point (where the info of the particle momentum is stored) and the hits/digits/clusters (where we need such information).

I modified the edepsim code to store momentum info at each start and stop point of each hits so that we can have the 1:1 correspondency. Note that the custom edepsim build is needed or this branch will crash.