[439337] Have CDOLockState prefetch to improve loading time 

- Have CDOLockState prefetch to improve loading time when an
EContentAdapter exists on the ResourceSet.
- Bugzilla_439337_Test added to the suite to test CDOLockState prefetch.
- CDOView.options().isLockStatePrefetchEnabled()/setLockStatePrefetchEnabled()
new option
has been added to the API to allow CDOLockStates prefetch.
- org.eclipse.emf.cdo.common.revision.CDORevisionsLoadedEvent has been
added in API to be notified of new CDORevision loaded from
RevisionLoader.
- The difficulty is to have CDOViewImpl.objects cache filled before
updating the CDOViewImpl.lockStates cache.

Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=439337
Change-Id: I061d91b30f732f8d67eaeb6215b4039e36d73f2d
Signed-off-by: Esteban Dugueperoux <esteban.dugueperoux@obeo.fr>