core-service basic rest structure
Spring of version 6.0+ requires Java version 17+.
In addition I have changed all versions from snapshot to '1.0.0'. I am not completely sure, but I read somewhere that the 'snapshot' version are in some way special and require extra configuration for plugins.
core-pom: remove data jpa dependency
I left it commented out because I presume we will be using it when the DBs will come.