Changes to Transaction volume charts

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/chart_count became optional for the status 200

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

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

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

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

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

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

the data/charts response's property type changed from object to no type for status 200

removed the required property data/charts/my-wallet-n-users from the response with the 200 status

removed the required property data/charts/n-unique-addresses from the response with the 200 status

added Charts subschema #2 to the data/charts 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