Potential simplification (and speedup) of Vavilov implementation

[dpiparo]

The construction of the VVIObjF object is responsible for 2.5% of the Phase-2 reconstruction, despite the advanced performance optimizations implemented in the past.
However, it seems that in our code, a simplified version of the constructor could be invoked, with the beta2 and mode parameters set to 1.

[cmsbuild]

A new Issue was created by @dpiparo Danilo Piparo.

@Dr15Jones, @perrotta, @dpiparo, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

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[makortel]

assign reconstruction

[makortel]

type performance-improvements

[cmsbuild]

New categories assigned: reconstruction

@jpata,@slava77,@clacaputo you have been requested to review this Pull request/Issue and eventually sign? Thanks

[mmusich]

@dpiparo is #37533 along the lines of what you had in mind?