nWaku v0.37 store regression

[AlbertoSoutullo]

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Description

Experiment with different sizes of an experiment setup to better test store protocol. For example, 500 nWaku relay nodes and 5 store nodes (+2 bootstrap nodes) should be enough. Inject a bunch of messages, and then query. Scenario should be is fast and reproducible. Understand what is the behavior of get store messages. The intention is to query nodes that are not store nodes, to see if they are able to retrieve the messages. Document different responses of the query. Analyze the behavior.