Updated projects to properly fetch paginated results+precache on start

Added layer between validation and projects API layer. New service for pagination of projects. This uses manually incrementing pages rather than using link headers. This is not easily done within the RESTeasy API builder paradigm, and will be taken as technical debt to fix. Added separate cache layer to solve issue with long load times and always available data with Loading rather than on demand cache.

Signed-off-by: Martin Lowe martin.lowe@eclipse-foundation.org