Set consistent colour ranges on plot_maps_dashboard()

[byersiiasa]

There are two modes for this function

1. one scenario, multiple indicators
2. one indicator, multiple scenarios

If #2, it is showing the same indicator for multiple IAM scenarios. In this case the colour range, vmin, vmax etc for cmap should be the same for each plot.
@mwerning - can you investigate if this can be done in hvplot? Presumably Dan had done this before

[byersiiasa]

Can be tested using the files in here:
https://iiasahub.sharepoint.com/:f:/r/sites/eceprog/Shared%20Documents/Research%20Theme%20-%20NEXUS/RIME_GEO/[rime_output_maps](https://iiasahub.sharepoint.com/:f:/r/sites/eceprog/Shared%20Documents/Research%20Theme%20-%20NEXUS/RIME_GEO/rime_output_maps?csf=1&web=1&e=VQNReN)?csf=1&web=1&e=VQNReN

something a bit like the below

from rime.rime_functions import *

ind = 'hw_99_5'
ftype = 'diff'
filename = f"{output_folder_maps}maps_multiscenario_{ind}_{ftype}.nc"
maps = xr.open_dataset(filename)
year =  2050
filename = f"{wd_GEO}/rime_output_maps/dashboard_{ind}_{ftype}_{year}.html"
plot_maps_dashboard(
    maps.sel(variable=temp_variable),
    filename=filename,
    year=year,
    cmap="magma_r",
    shared_axes=True,
    clim=None,
)

There seems even to be clim in the input arguments to the function but it was never implemented.

[mwerning]

Please see pull request. Happy to discuss options for improving the current implementation.