Additional info dict

[hmperk18]

Make light_curve_data's additional_info a dictionary rather than a list of values

[github-actions]

Before [7195475]	After [42a08a7]	Ratio	Benchmark (Parameter)
195M	197M	1.01	benchmarks.peakmem_learn_loop('KNN')
186M	188M	1.01	benchmarks.peakmem_learn_loop('RandomForest')
153±3ms	154±1ms	1.01	benchmarks.time_learn_loop('KNN', 'UncSampling')
2.58±0.01s	2.59±0.01s	1	benchmarks.time_learn_loop('RandomForest', 'RandomSampling')
2.63±0.02s	2.57±0s	0.97	benchmarks.time_learn_loop('RandomForest', 'UncSampling')
157±10ms	151±3ms	0.96	benchmarks.time_learn_loop('KNN', 'RandomSampling')
146±10ms	133±4ms	0.91	benchmarks.time_feature_creation

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