Service updates

• Migrated missing disagg services to Micronaut
  • Disagg at IML endpoint
  • Disagg at return period endpoint
• Refactored hazard and disagg controllers and services
• Organizing service groups by package

See #476 (closed)

changed milestone to %NSHM Hazard Tool launch

added Hazard-Disagg Services labels

mentioned in commit 6e2a2c1f

merged

mentioned in issue nshmp-apps#82 (closed)