FTP/FTPS and SFTP: Don't convert body to String, leave as-is or at le…

…ast try to convert to inputstream - SFTP Kamelet

Fixes #121

sftp-source.kamelet.yaml

@@ -53,14 +53,18 @@ spec:
         description: If a directory, will look for files in all the sub-directories as well.
         type: boolean
         default: false
+      idempotent:
+        title: Idempotency
+        description: Skip already processed files.
+        type: boolean
+        default: true
   flow:
     from:
       uri: "sftp:{{username}}@{{host}}:{{port}}/{{directoryName}}"
       parameters:
         password: "{{password}}"
         passiveMode: "{{passiveMode}}"
         recursive: "{{recursive}}"
+        idempotent: "{{idempotent}}"
       steps:
-      - convert-body-to:
-          type: "java.lang.String"
       - to: "kamelet:sink"