Improve Alpaka EDModule/ESModule API

[makortel]

This umbrella issue collects various activities done in the "Alpaka framework" after #316 / https://github.com/cms-sw/framework-team/milestone/19 and #696

• Make edm::ESProducts functional in Alpaka ESProducts #614
• Add tests for multiple Alpaka ESProducer production functions #635
• Extend Alpaka EDModule API to allow additional host-side tasks between acquire() and produce() #651
• Add tests for which (backend's) plugin gets used for PSet validation with (Alpaka) ModuleTypeResolver #698
• Create example of Alpaka ESProduct that has two PortableCollection members #719
• Add ActivityRegistry callbacks to the Transformer ability functions #727
• Create a utility class to copy a host side object to all devices of a given Alpaka backend #786
• Simplify definition of PortableMultiCollection<TDev, ...>, and allow it to be used outside of ALPAKA_ACCELERATOR_NAMESPACE #824
• Ignore errors from alpaka::enqueue() in CachingAllocator::free() #884
• Reduce Alpaka event synchronization calls via EDMetadata #902
• Add tests for Alpaka EDModule behavior when another module throwing an exception causes framework to shut down #965
• Add more verifications to Alpaka ESProducer testing #1088
• Add synchronize parameter to alpaka PSet of Alpaka modules #1115
• Make Alpaka EDProducers to implicitly copy their host products to device if a copy function exists #1116
• Make Alpaka ESProducer asynchronous #1126

Migrating user code to use the new facilities

• Make implicit copy of TrackingRecHitsSoACollection<TrackerTraits> to host asynchronous #1128
• Replace configuration-only ESProducers with MoveToDeviceCache #1129