[BEAM-13569] Change Spark dependencies to implementation.
[BEAM-13569] Change Spark dependencies to implementation.

They are needed to spin up a standalone Spark cluster.

lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,robertwb/incubator-beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,robertwb/incubator-beam,chamikaramj/beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,apache/beam,apache/beam,apache/beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam