Changes to Foundational Time Series Model Multi Series

added the new optional request property series/start_datetime

added the new optional request property feature_contributions_type

the model request property type changed from no type to string

added the new optional request property model_parameters

added the new optional request property multivariate

added the new optional request property series/categorical_exog

request property series/X/anyOf[subschema #1]/items/items list-of-types was widened by adding types string to media type application/json

request property series/X_future/anyOf[subschema #1]/items/items list-of-types was widened by adding types string to media type application/json

added the optional property detail/items/ctx to the response with the 422 status

added the optional property detail/items/input to the response with the 422 status