STOW-RS: adjust accepted and returned content type from application/json to application/dicom+json

[gunterze]

No description provided.

[vrindanayak]

Storage works with application/json as well. Need below code in StowRS.java

        if (getHeaderParamValue(headerParams, "transfer-syntax") != null) {
          Map<String, String> parameters = new HashMap<>();
          parameters.put("transfer-syntax", "1.2.840.10008.1.2.4.50");
          MediaType mediaType = new MediaType("image", "jpeg", parameters);
        }

because MediaTypes.transferSyntaxOf called from StowRS.java checks for below condition :

        String tsuid = bulkdataMediaType.getParameters().get("transfer-syntax");
           if (tsuid != null)
            return tsuid;

[vrindanayak]

Support not extended on server side for application/json.