Rewrite "find_proposal" and "find_witness" to use CommandDataRetrieval and return Proposal/Witness models from clive
Currently we use Proposal/Witness model from schemas. Using model from clive would allow us to make data formatting in one place, we use clive models already in "retrieve_proposals_data" and "retrieve_witnesses_data", all those commands could be unified and return same model. Currently there is but this could be written similarily as in class WitnessesDataRetrieval(CommandDataRetrieval[HarvestedDataRaw, SanitizedData, WitnessesData])
Edited by Marcin Sobczyk