Update scatterplotmatrix

From here https://github.com/insightsengineering/teal.modules.general/issues/38 we can rewrite the scatterplotmatrix and then remove the lattice package as a dependency.

See https://github.com/insightsengineering/teal.modules.general/issues/38#issuecomment-1103717211 for example code and what the graph will look like (to generate ANL for the code snippet use the scatterplotmatrix roxygen example make the same selection and look at the SRC).

We should make sure a new set of options are available (e.g. table font size) and `get_single_grob` or its equivalent should probably be a exported function in tmg so that the SRC isn't completely crazy