PublicEndpointGenerator is bound to the source data address type

[ndr-brt]

Bug Report

Describe the Bug

It's not possible to get data from a source type different from HttpData using HttpData-PULL transferType.

Expected Behavior

source and destination types should be independent, e.g. i should be able to get data from an SFTP endpoint through an HttpData-PULL type

Observed Behavior

Transfer fails with an error like:
TransferProcess: ID c62e4b59-a79d-4181-bd9f-843ce7afb85e. Fatal error while Initiate data flow. Error details: No Endpoint generator function registered for source data type 'SFTP'

Possible Implementation

the PublicEndpointGeneratorServiceImpl is getting the source address, but it should get the destination