add /scanBody as a REST handler that simply scans the body w/o using multipart/form-data

[filex]

For a REST API client the need to POST the file as multipart/form-data feels a bit cumbersome. There is only one file to be scanned at a time, its name does not matter either.

This P/R adds another endpoint /scanBody that simply scans the posted body. This makes it easier to use:

$ curl -i -d @eicar.com.txt http://localhost:9000/scanBody
HTTP/1.1 406 Not Acceptable
Content-Type: application/json; charset=utf-8
Date: Thu, 06 Jan 2022 17:04:55 GMT
Content-Length: 56

{ Status: "FOUND", Description: "Win.Test.EICAR_HDB-1" }