Changes to Get invoices stats

for the query request parameter currency, default value TON was removed

the currency response's property default value TON was removed for the status 200

added the new optional query request parameter currency

added the required property stats/currency to the response with the 200 status

the stats/success_in_week response's property format changed from uint32 to uint64 for status 200

the stats/success_total response's property format changed from uint32 to uint64 for status 200

removed the required property stats/awaiting_payment from the response with the 200 status

added the required property stats/invoices_in_progress to the response with the 200 status

added the required property stats/total_amount_pending to the response with the 200 status

endpoint added

api path removed without deprecation

added the new required query request parameter app_id

endpoint added