[PWGDQ] Modified the trimming options for the bimodal coefficiencts; Fill bimodality and other quantities in the VarManager; Add histograms in the library (#15098)

Co-authored-by: Ionut Cristian Arsene <iarsene@cern.ch>
Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: 3 people