[EMCAL] implementation of number of local maxima variable

[fjonasALICE]

• finally implemented number of local maxima variable calculation, which so far was filled with a dummy value
• the calculation handles correctly gaps between SMs and clusters that span across multiple SMs by implementing a new geometry function to get a global column and row. This function is ported from the clusterizer itself, and introduces artificial column gaps to correctly reflect large gaps between SMs. This means the behavior of the NLM calculation is consistent with clusterization code. For either access, I ported the function to the geometry class

Tested locally for:
kV3Default: a few clusters with more than one NLM (as expected)
kV3NoSplit: the definition where average NLM is highest (as expected)
kV3MostSplit: NLM is always one (as expected).

to improve performance and reduce geometry calls, the calculation is performed only once for all cells in a given cluster

[github-actions]

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