Reduce time to initialise SamplesDict class and samples_dict property
The purpose of this MR is to reduce the time taken to initialise the pesummary.utils.samples_dict.SamplesDict class and the time taken to evaluate the samples_dict property.
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The purpose of this MR is to reduce the time taken to initialise the pesummary.utils.samples_dict.SamplesDict class and the time taken to evaluate the samples_dict property.