Use rison instead of json when encoding form_data in URL

[betodealmeida]

Feature suggestion: use rison (https://github.com/pifantastic/python-rison) instead of json when encoding form_data in the URL. Here's a comparison between both:

%7B%22datasource%22%3A%223__table%22%2C%22viz_type%22%3A%22dual_line%22%2C%22slice_id%22%3A21%2C%22granularity_sqla%22%3Anull%2C%22time_grain_sqla%22%3Anull%2C%22since%22%3A%22100+years+ago%22%2C%22until%22%3A%22now%22%2C%22color_scheme%22%3A%22bnbColors%22%2C%22x_axis_format%22%3A%22smart_date%22%2C%22metric%22%3A%22avg__num%22%2C%22y_axis_format%22%3A%22.3s%22%2C%22metric_2%22%3A%22sum__num%22%2C%22y_axis_2_format%22%3A%22.3s%22%2C%22annotation_layers%22%3A%5B%5D%2C%22where%22%3A%22%22%2C%22having%22%3A%22%22%2C%22filters%22%3A%5B%5D%2C%22extra_filters%22%3A%5B%5D%7D

(annotation_layers:!(),color_scheme:bnbColors,datasource:'3__table',extra_filters:!(),filters:!(),granularity_sqla:!n,having:'',metric:avg__num,metric_2:sum__num,since:'100+years+ago',slice_id:21,time_grain_sqla:!n,until:now,viz_type:dual_line,where:'',x_axis_format:smart_date,y_axis_2_format:.3s,y_axis_format:.3s)

[mistercrunch]

@graceguo-supercat

[timifasubaa]

@graceguo-supercat

[betodealmeida]

#5152

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