Fixes #22 
This doesn't add every argument, but does add the core ones and trivial
ones

Here is a good example of the basic ways this can be used, either with
`x`, `y`, and `histfunc="count"`, or `x`, `y`, `z`, and any `histfunc`,
as well as other arguments to control the binning as, like `histogram`,
how someone chooses to bin has a large impact on the visualization

```
import deephaven.plot.express as dx
from deephaven import new_table, agg

from deephaven import time_table

result = time_table(period="PT1S").update(["X = randomGaussian(10, 3)", "Y = randomGaussian(10, 3)", "Z = randomGaussian(10, 3)"])

density_heatmap = dx.density_heatmap(result, "X", "Y", title="Test", range_bins_x=[0, 20], range_bins_y=[0, 20], nbinsx=20, nbinsy=20)
density_heatmap_z = dx.density_heatmap(result, "X", "Y", "Z", title="Test", histfunc="std", range_bins_x=[0, 20], range_bins_y=[0, 20], nbinsx=5, nbinsy=5)
```