Add visitor for operations.

Wieslaw Kedzierskirequested to merge
wkedzierski/288-known-accounts-visitor-no-get-impacted-accounts into develop

This MR introduce visitor pattern sceleton for operations. It allows to perform custom action on operaction based on implemented visitor.

This visitor pattern will allow us to define know_account_visitor pattern that will save account as know account from operations performed with cli command.

#288 (closed) - second part - save from cli command. First part - managing know account by cli command, is in separate MR !552 (merged)

Same as !575 (merged) but not using get_impacted_accounts from wax. (for comparrision, only one will be used.)

Edited by Wieslaw Kedzierski

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