[EVS API] Read ValidatedObject and XML Gazelle Validation Report through webservice

As SUT Operator, I MUST be able to read validated objects from development environment or from CI builds, calling web-services and without going through EVSClient GUI.

Acceptance criteria :

* As a validation client, I MUST be able to read a validatedobject resource by its OID using a GET request to EVSClient and I receive the requested complete validatedobject in XML.

I.e :
Request : GET EVSClient/rest/validatedObjects/1.3.6.1.4.1.12559.11.36.3.1.14342 HTTP/1.1
Accept: application/xml

Response : HTTP/1.1 200 OK
Content-Type: application/xml;charset=UTF-8

<?xml...>
<ValidatedObject oid="1.3.6.1.4.1.12559.11.36.3.1.14342" validationDate="2021-04-08T16:30:00"
   validationStatus="DONE_FAILED">
   <OwnerMetadata username="ceoche" organization="IHE Europe" private="true" />
   <ValidationService name="SchematronValidator" validator="ANS - CR-BIO - v2021-02-15"/>
   <Object type="CR-BIO" location="EVSClient/rest/validatedObjects/1.3.6.1.4.1.12559.11.36.3.1.14342/object" />
   <ValidationReport location="EVSClient/rest/validatedObjects/1.3.6.1.4.1.12559.11.36.3.1.14342/validationReport" />
</ValidatedObject>

* As a validation client, I MUST be able to read a validationReport by using the validatedobject OID using a GET request to EVSClient and I receive the requested complete validationReport in XML.

I.e :
Request : GET EVSClient/rest/validatedObjects/1.3.6.1.4.1.12559.11.36.3.1.14342/validationReport HTTP/1.1
Accept: application/xml

Response : HTTP/1.1 200 OK
Content-Type: application/xml;charset=UTF-8

<xml.... >

* Exception handling on client parameters :
       - If the OID used as parameter is unknown, EVSClient must respond with HTTP 404 Not found
       - If the OID used as parameter refers to a private validatedobject, EVSClient must respond with HTTP 401 Unauthorized

Related requirements :

[EVS-14]
[EVS-58]
[EVS-59]
[EVS-61]
[EVS-64]
[EVS-69]
[EVS-70]
[EVS-74]

Technical details :

* Gazelle Validation report MUST support Java 7
* An XML presenter will be improved for the ValidatedObject
* An XML presenter will be required for the Gazelle Validation report