refactor!: Remove deprecated parameters from Entity and FeatureView (feast-dev#2427)

* Remove labels parameter from Entity

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

* Remove input parameter and deprecate Duration type for ttl parameter in FeatureView

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

* Change examples to stop using Duration

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

* Delete unused example feature repo

Signed-off-by: Felix Wang <wangfelix98@gmail.com>

* Format

Signed-off-by: Felix Wang <wangfelix98@gmail.com>
Signed-off-by: Tomas Pereira de Vasconcelos <tomasvasconcelos1@gmail.com>

Author: felixwang9817