feat: create ChainAccount, ChainCategory and ChainContribution from raw data#162

jbern0rd merged 3 commits intomainiExecBlockchainComputing/iexec-commons-poco:mainfrom

feature/account-category-contribution-from-raw-dataiExecBlockchainComputing/iexec-commons-poco:feature/account-category-contribution-from-raw-dataCopy head branch name to clipboard