Extract Msf::DBManager::Client

MSP-11124

Extract methods related to `Mdm::Client`s.
Extract Msf::DBManager::Client shared examples

MSP-11124
Extract Msf::DBManager::Event

MSP-11124

Extract methods related to `Mdm::Event`s.
Extract Msf::DBManager::Event shared examples

MSP-11124
Extract Msf::DBManager::Report

MSP-11124

Extract methods related to the obsolete `Mdm::Report`.  These methods
should be deleted, but since this branch is just for moves, I won't
delete them now.
Extract Msf::DBManager::Report shared examples

MSP-11124
Extract Msf::DBManager::Task

MSP-11124

Extract methods related to `Mdm::Task`s.
Extract Msf::DBManager::Task shared examples

MSP-11124
Extract Msf::DBManager::ExploitAttempt

MSP-11124

Extract methods that create `Mdm::ExploitAttempt`s.
Extract Msf::DBManager::ExploitAttempt shared examples

MSP-11124