Configurable data size limit for API parser input

The API parser currently applies a fixed data size limit of approximately 2MB when receiving payloads from custom API adapters. When the data passed to the parser exceeds this threshold, the parser returns a truncated string rather than the complete payload, with no option to adjust the limit. This enhancement would make the API parser data size limit a configurable setting, allowing administrators to raise the threshold to match their integration needs. Customers building custom API adapters that return larger data sets would be able to process complete responses without truncation or the need for workarounds that split data into smaller chunks.