Move TMV Utils To LHCbMath Kernel

Merged Andre Gunther requested to merge gunther_moveTMVAutils into master

Unify the neural network implementation utility by moving it from Rec to LHCb. On the way, small changes are applied to allow the compiler to better optimise, which gives a small speed-up 🌞

/cc @graven @decianm

Goes with Rec!2641 (merged)

Edited by Andre Gunther

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