Feature: Aggregate using one or more operations over the specified axis.

[kobebryant432]

Is your feature request related to a problem?

I'm always frustrated when I need to resample a ds and the resampling method is different for the variables present, i.e. for one variable I want the sum and for the other the mean.

Describe the solution you'd like

Ideally there would be some functionality similar to pandas .agg functionality.
Not sure if this is feasible.

ds = ds.resample(time="D").agg({"pr":"sum","tas":np.mean})

Describe alternatives you've considered

Current workaround which gets unwieldy for multiple variables.

ds_pr = ds.pr.resample(time="D").sum()
ds_tas = ds.tas.resample(time="D").mean()

ds = xr.merge([ds_pr, ds_tas])

Additional context

No response

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