Import Attachment Base64 Embedded file using New Inbound v3 processing

The pushing attachment Base64 file supported with New Version V3 that is able to handle hierarchical message payload for the inbound processing.

Enhance formula mapping to work with source field that is the same function name

In the previous version, the source field name that is the same function name was not allowed to do formula mapping. Otherwise, the error will occur while mapping processing can be an error or getting incorrect formula. The formula enhanced to work with the source field that is the same function. The format is required as {!Source Field}.