Implement a thread-safe particle container merger.

Lucas Meyer Garciarequested to merge
particle_container_merger into master

Implement a thread-safe particle container merger to replace the FilterDesktop used in ParticleContainersMerger, defined in algorithms.py.

Depends on LHCb!3274 (merged).

Needed for Moore!1033 (merged).

FYI: @sstahl @rmatev

Edited by Lucas Meyer Garcia

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