Support new event subscription options sync/async/noread

This new cppTango feature, cppTango#1344 (closed), needs to be implemented in PyTango as well.

ALBA is working on it here: https://gitlab.com/alba-synchrotron/controls-section/pytango/-/tree/async_subscribe?ref_type=heads

Related MR: cppTango!1395 (merged)