Add the versioning headers check in the REST API Document Creation

• We should add org.nuxeo.ecm.restapi.server.jaxrs.JSONDocumentObject#versioningDocFromHeaderIfExists into the org.nuxeo.ecm.restapi.server.jaxrs.JSONDocumentObject#doPost
• This adding will insert into context data the available headers related to versions X-Versioning-Option or source
• Although those headers won't be checked during the creation, they could be used afterward through the versioning policy contributions

For instance we could have a rule as follow:
<condition>#

</condition>

NXP-26813 will add as a new feature, the management of those headers in org.nuxeo.ecm.core.api.AbstractSession#createDocument(DocumentModel)