Escher auth encode "reserved character" on query params

[Portshift-Admin]

the “reserved characters” defined by RFC3986 (Uniform Resource Identifier) have to be kept as they are (no encoding applied)
The code currently encode everything (refering to https://github.com/emartech/escher-java/blob/96eacf0ead41cad72f388a4de31d9dabc501f525/src/main/java/com/emarsys/escher/Helper.java and to the function "private String queryParameterToString(NameValuePair entry)"