Draft: sTGC offline raw monitoring: strip efficiency re-implementation

Re-implementation of sTGC strip efficiency which fix a buggy behavior spotted in recent runs in the offline DQ. This behavior makes the global-Y vs global-X plots looks pretty similar between layers that belongs to the same multiplet (see e.g. run_472634). In order to fix this issue, in this MR the following changes are introduced:

• Extrapolation to compute hole in the z-coordinate is performed after requiring 4/8 active layers, i.e. if less than 4 layers are active then the extrapolation is performed.
• Transition between quads is being take into account.
• removal of
  $p_T < 15\ \mathrm{[GeV]}$
  cut.

Additionally, this new implementation add the following new features:

• Use of local std::array's defined for each each iteration of the xAOD muon container, where the active layers are stored.

Tagging: @carquin @estel @pscholer