Changes to SWEA catalog (series + groups)

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

the response property data/group_count became optional for the status 200

the response property data/groups_flat became optional for the status 200

the response property data/groups_tree became optional for the status 200

the response property data/series became optional for the status 200

the response property data/series_count became optional for the status 200

response property data/group_count list-of-types was widened by adding types null and number to media type application/json of response 200

response property data/groups_flat list-of-types was widened by adding types null to media type application/json of response 200

response property data/series list-of-types was widened by adding types null to media type application/json of response 200

response property data/series_count list-of-types was widened by adding types null and number to media type application/json of response 200

added subschema #1 subschema #2 to the data/groups_tree response property anyOf list for the response status 200

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