added updater as interface

jams-common/src/main/java/module-info.java

...rc/main/java/net/jami/jams/common/updater/AppUpdater.java

...mmon/updater/subscription/SubscriptionStatusResponse.java

...mi/jams/common/updater/subscription/SubscriptionType.java

jams-server/src/main/java/net/jami/jams/server/Server.java

...s/server/core/workflows/ActivateSubscriptionWorkflow.java

.../jams/server/servlets/api/update/SubscriptionServlet.java

...t/jami/jams/server/servlets/api/update/UpdateServlet.java

...main/java/net/jami/jams/server/startup/UpdaterLoader.java

pom.xml

updater/pom.xml

updater/src/main/java/module-info.java

updater/src/main/java/net/jami/jams/updater/JAMSUpdater.java

...er/src/main/java/net/jami/jams/updater/SFLTrustStore.java

.../src/main/java/net/jami/jams/updater/UpdateCheckTask.java

...ter/src/main/java/net/jami/jams/updater/UpdateDaemon.java

...src/main/java/net/jami/jams/updater/UpdateDownloader.java

updater/src/main/resources/ca.crt