Metrics fields factory

[nfarabullini]

Implementation of metrics fields wrt new factory format

[halungge]

I did not review everything, but added a couple of comments, which you could fix.

For the metrics factory itself, and the metrics field stencil computations. There are a couple of them that we should fuse/inline such that in the factory only the fields that are really used in the model are registered. So all the fields that are local fields in mo_vertical_grid.f90 we should inline in the stencil functions that use them: for example
z_aux2, z_ifv, z_me . In most cases that should work. There might remain one or two where the combination which are done separately because of missing gt4py support.

[nfarabullini]

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[github-actions]

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