TPC: Processing of common mode values in O2

[tubagundem]

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[shahor02]

Could the class methods with lot of code be moved from the header to cxx file (including needed headers, like TFile.h and TTree.h in https://github.com/AliceO2Group/AliceO2/pull/15137/changes#diff-74cad5f291e0478b7a6334eb7e3dcdabbad615a01df0db129d836a337e76582aR26-R27 ?