Deprecate Pipeline

It would be nice to have an option to boost the data point size when the overall view occupancy is low. A quick look at an example like this makes me feel like there could be some fixed ratios that could be used to 2x, 3x, 4x the marker area as overall pixel occupancy drops. This may not be feasible when there are overlapping data categories with different markers or colors, if I'm understanding Datashader's pipeline which I believe leads to a rasterized (rather than vector) image, but if it were *optional* then the choice to use this could be left to the developer.

Start by reviewing the linked screenshot and the Datashader pipeline behavior described in the issue. Define how optional marker-area scaling should respond to low pixel occupancy, including overlapping categories, and identify a suitable implementation and validation path; the issue names no files or tests.

Written by the indexing model from the issue text.