feat: Automatically set zoom and centroid for scatter tile maps

[ndrezn]

using some slightly modified examples in https://plotly.com/python/tile-scatter-maps/.

If I try (FYI need to install geopandas<1.0, note removal of the zoom setting):

import plotly.express as px
import geopandas as gpd

geo_df = gpd.read_file(gpd.datasets.get_path("naturalearth_cities"))

fig = px.scatter_map(
    geo_df,
    lat=geo_df.geometry.y,
    lon=geo_df.geometry.x,
    hover_name="name",
)
fig.show()

Then I get:

Which is bad. We should set the Zoom to cover as many points as possible. Centroid on Africa seems reasonable for this example but not sure how it's determined.

Though I notice with some PX calls the centre point seems set automatically (note I removed the zoom level):

import plotly.express as px

df = px.data.carshare()
fig = px.scatter_map(
    df,
    lat="centroid_lat",
    lon="centroid_lon",
    color="peak_hour",
    size="car_hours",
    color_continuous_scale=px.colors.cyclical.IceFire,
)
fig.show()

Some investigation required to understand the current behaviour.