Improve Runtime Dependencies Management

Goal: improve tracking of dependencies between bundles to:

• correctly handle shutdown
• correctly handle hot reload of linked bundles/components
• ease up dependencies management in tests
• allow deploying "optional components" (see NXP-16638) --> postponed for this first step

This can be done by:

• tracking startup order to be sure we do run the shutdown in the reverse order
• reviewing the applicationStartup system to:
  • make sure that one failure does not crash all deployments
  • add explicit dependencies management rather than numerical ordering? see RegistrationInfo#getApplicationStartedOrder
  • create a deploymentCompleted event?