impr(engine): method ordering in case service

restraucture method ordering in case service to follow interaction
and usage patterns

related to #CAM-2803
chore (welcome screen): updated tasklist screenshot

related to #CAM-2775
chore(maven): change bom's parent to release-parent

- change parent
- add spin, commons, connect and template-engines

related to #CAM-2860
chore(engine): make spin optional

-- removes spin from engine classpath for tests
-- adds a profile "with-spin" which adds spin to classpath

Related to: #CAM-2552