method to create training sets with mock data

[gschwend]

Implement a method in pzserver lib to create training sets with mock data from the parquet files stored on Lustre.

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1. default method = random selection
2. alternative method = mimic observed sample #103
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[deborajanini]

@gschwend qual o tamanho desta issue?

[gschwend]

@deborajanini large (já atualizei), também coloquei a segunda parte em um issue separado (em backlog)