Changes to Available IMF SDMX 3.0 dataflow families

added the non-success response with the status 500

added the optional property meta/stale_since to the response with the 200 status

added the optional property meta/data_age_days to the response with the 200 status

added the optional property meta/notes to the response with the 200 status

added the optional property meta/period to the response with the 200 status

response property data/dataflows/anyOf[subschema #1]/items/dimensions/anyOf[subschema #1]/items/ list-of-types was widened by adding types null to media type application/json of response 200

response property data/dataflows/anyOf[subschema #1]/items/frequencies/anyOf[subschema #1]/items/ list-of-types was widened by adding types null to media type application/json of response 200

added the optional property data/count to the response with the 200 status

added the optional property data/dataflows to the response with the 200 status

added the optional property data/note to the response with the 200 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 429 status

added the optional property code to the response with the 503 status

added the optional property hint to the response with the 401 status

added the optional property hint to the response with the 429 status

added the optional property hint to the response with the 503 status

added the optional property plan to the response with the 401 status

added the optional property plan to the response with the 429 status

added the optional property plan to the response with the 503 status

added the optional property reason to the response with the 401 status

added the optional property reason to the response with the 429 status

added the optional property reason to the response with the 503 status