adding h_nelec_sed and h_e_sed to SRTrueCaloPoint for better recombination studies

[sungbinoh]

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Description

Adding h_nelec_sed and h_e_sed to SRTrueCaloPoint for better recombination studies.
These variables will save deposited energy and number of ionizing electrons collected from simEnergyDeposit within wire channel position +- spacing/2. They correspond to the true deposited energy and number of ionizing electrons in the hit pitch.