NXCALS-3713 Association in group relations

#Merge request template @acc-logging-team - please have a look for approval.

main features

• GroupData now accounts for association in variables and entities
• Group now accounts for association in variables and entities
• GroupService now uses the associations
• HierarchyService now uses the associations
• SnapshotProperties now use the associations

secondary features

• VariableService added method findExactly for internal use: avoids a lot of code repetition
• EntityService added method findExactly for internal use: avoids a lot of code repetition
• fixed bug in EntityService when extracting more than 1000 entities
• GlobalObjectMapperProvider is now our unified jackson mapper, for server (SpringConfig) and client side (FeignBuilderProvider)
• QuerySnapshotDataServiceImpl now correctly searches when absent description or owner

minor features

• TimescalingProperties added method equals and hashCode
• SnapshotCriteria now correctly handles empty values
• HierarchySet added method collector
• Hierarchy fixed path display
• MetaDataServiceImpl uses newer Hierarchies.suchThat() methods and collectors
• GroupProvider now uses uncached methods
• ~600 lines of new tests

Closes NXCALS-3713