Allow dictionaries as Dimension specs

[philippjfr]

When constructing an element and you want to supply explicit dimension ranges (or values, or any of the other Dimension attributes) you currently have to supply explicit Dimension objects or use redim after the fact:

hv.Image(..., vdims=hv.Dimension('Temperature', range=(0, 30)))

hv.Image(..., vdims='Temperature').redim.range(Temperature=(0, 30))

Being able to define Dimensions with dictionaries in the constructor can in some cases be nicer and more readable:

hv.Image(..., vdims={'name': 'Temperature', 'range': (0, 30)})

and also just matches what is already valid in redim:

hv.Image(...).redim(z={'name': 'Temperature', 'range': (0, 30)})

[jlstevens]

I don't have any strong objection to this really. My main concern is that there may be too many ways of doing the same thing already and that impacts readability.

[github-actions]

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