Should we wrap `draw_legend` in `recordGraphics`?

[grantmcdermott]

Or, at least, wrap the the final return object in recordGraphics(). Would require something like changing lines 360-364 here to:

  if (isTRUE(gradient)) {
    recordGraphics(
      gradient_legend(legend.args = legend.args, lmar = lmar, outer_right = outer_right, outer_bottom = outer_bottom),
      list(legend.args = legend.args, lmar = lmar, outer_right = outer_right, outer_bottom = outer_bottom),
      getNamespace("tinyplot")
    )
  } else {
    recordGraphics(
      do.call("legend", legend.args),
      list(legend.args = legend.args),
      getNamespace("tinyplot")
    )

Reason: This would ensure that the legend spacing (e.g., gaps between groups and labels) is preserved even if we resize the plot. Right now, resizing is kind of annoying because it messes up the spacing of the current plot.