Remove `ggmosaic` from dependency

[donyunardi]

What happened?

Let's remove ggmosaic deps from tmg.

For now, we will add a validation error saying that we're not supporting "factor" class in situation where both x and y are factorial.

teal.modules.general/R/tm_g_bivariate.R

Lines 930 to 937 in 5670f12

	} else if (x_class == "factor" && y_class == "factor") {
	plot_call <- reduce_plot_call(
	plot_call,
	substitute(
	ggmosaic::geom_mosaic(aes(x = ggmosaic::product(xval), fill = yval), na.rm = TRUE),
	env = list(xval = x, yval = y)
	)
	)

sessionInfo()

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[m7pr]

Closed with #935