[WIP] rely on spring to manage jwt encoding, deconding, refreshing ?

[cmangeat]

making the things simplier, considering

https://stackoverflow.com/questions/39210683/how-inmemorytokenstore-works-with-spring-security-oauth2-and-is-this-the-safest/39662709#39662709

[fxprunayre]

FYI. I'm moving that PR to the new project structure and will resolve conflicts

[cmangeat]

note that this PR is in WIP state and that sole authorizing and searching modules have been "processed", at the end common security and other modules should be adapted also.

[fxprunayre]

Replaced by https://github.com/geonetwork/geonetwork-microservices/pull/20