Including FPGA C in JwoJ MET calculation for gFEX

With this MR, the calculation of the global quantities with the FPGA C (forward region) is included in the JwJ algorithm. In particular:

• the two gTower matrices representing the two halves (negative and positive in eta) of the FPGA C are combined in one unique matrix with the same format of the central matrices representing FPGA A and B. This reflects what is done in firmware.
• the various steps of the MET and energy calculation can be performed for the FPGA C, whose contribution can be included in the final result
• the inclusion of the FPGA C in the JwoJ calculation is enabled by the ENABLE_JWOJ_C flag, which is currently set to false