Dump may not be a exe

[yankovs]

Hey!

Currently dumps that have configs extracted from are uploaded to MWDB as dump:win32:exe. However, they might be for example DLLs, as is happens for example with this qbot sample: d4535652381dbee7f1640be141fe75c7ff61123dbebbe58edd91591eb64b3f70. Also, maybe not win32.

I'm not sure platform detection logic should be part of this Karton as it defeats the single responsibility design of the system as a whole. However, it might be sent to Karton as a raw file with kind: dump in persistent headers. This can be checked in classifier to prepend the dump: prefix to whatever it is it found.