Allow for SortingAnalyzer or BaseSorter in plot_*

[chrishalcrow]

Following on from discussion in #3937, this PR allows the user to pass a SortingAnalyzer to plot_isi_distribution.

Will also add to plot_rasters, plot_unit_presence and plot_probe_map. Before I do, is the strategy here fine? I've replace the sorting argument with sorting_analyzer_or_sorting. I think most users use this as

si.plot_isi_distribution(analyzer)

so won't notice any difference.

For anyone passing sorting=sorting, I've deprecated the argument.

[zm711]

I think this is good from my perspective and should be extended to all widget functions. Maybe we should add a developer comment to mention which functions need the sorting and which need the analyzer, but that might also be clear by us adding the ensure_sorting or ensure_sorting_analyzer functions.