Implemented a hacky, but working session store example

Closes #3493479

config/install/persistent_visitor_parameters.settings.yml

 get_parameters: []
 server_parameters: []
 mode: 'first_touch'
-cookie_expire: 0
-dont_respect_dnt: false
+persistor: 'persistor_private_temp_store'
+persistor_key: 'pvp_stored_variables'
+persistor_expire: 0
+respect_dnt: true
 server_parameters_on_get_parameters_only: false
 allow_unsafe_deserialization: false