Changes to Get Explorations

added the required property explorations/items/domain/namespace to the response with the 200 status

added the required property explorations/items/finalizers to the response with the 200 status

added the required property explorations/items/status to the response with the 200 status

query request parameter filter_to_user_with_assigment list-of-types was narrowed by removing types null

for the query request parameter filter_to_user_with_assigment, the type was generalized from no type to string, and format from no format to uuid

added the new optional query request parameter filter_to_user_with_assigment

added the non-success response with the status 422

endpoint added