add 2B signals into samples

[De-Cristo]

1. add Hbb signal samples into the main branch, include all the Lep channels and 2Q channel
2. add some of the missing ext samples into the list to enhance the statistics (maybe?)
   e.g. /DYto2L-2Jets_MLL-50_TuneCP5_13p6TeV_amcatnloFXFX-pythia8/Run3Summer22NanoAODv12-130X_mcRun3_2022_realistic_v5_ext1-v1/NANOAODSIM

[De-Cristo]

There could be more ext samples to be added (if I understand them correctly)

[De-Cristo]

0. configuration file for vhbb ZLL channel cfg_VHbb_ZLL.py
1. add neccesary functions (for now) in the CommomSelectors.py without touching the existing ones
2. add custom configurations in param dir to control the runing and plotting
3. add workflow_VHbb based on the newest update from the main branch

[andreypz]

Looks good, except a small fix for lep_flav name is needed.