Display integer values without fractional part in tooltips

[IKupriyanov-HORIS]

from lets_plot import *
LetsPlot.setup_html()

d = {
    'l': [3],
}
ggplot(d, aes(color='l')) + geom_point() + ggsize(300, 200)

from lets_plot import *
LetsPlot.setup_html()

d = {
    'l': [3_000_000],
}
ggplot(d, aes(color='l')) + geom_point() + ggsize(300, 200)