JamiAccount, libjami: add getPasswordKey

bin/jni/configurationmanager.i

src/client/configurationmanager.cpp

src/jami/configurationmanager_interface.h

src/jamidht/account_manager.h

src/jamidht/archive_account_manager.cpp

src/jamidht/archive_account_manager.h

src/jamidht/jamiaccount.cpp

src/jamidht/jamiaccount.h

src/manager.cpp

src/manager.h