- added "Run API analysis builder as job" option for PDE
- this option is disabled by default
- enabling it would run API analysis builder tasks parallel to the
running Java build
- for full workspace build this avoids the problem that Java builder of
next projects to build have to wait for API build of the current project

Change-Id: Icac0487ba3dc14efc340afed43afd9407a2c7d1d
Reviewed-on: https://git.eclipse.org/r/c/pde/eclipse.pde.ui/+/186655
Tested-by: PDE Bot <pde-bot@eclipse.org>
Tested-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>
Reviewed-by: Vikas Chandra <Vikas.Chandra@in.ibm.com>