gstlal_ll_inspiral_aggregator: remove unneccesary Pool, change how kafka topics/partitions are arranged, add --across-jobs option to allow leaders

update gstlal_ll_dq, gstlal_ll_inspiral_aggregator to work with API change in ligo-scald introduced in 0.2

gstlal_ll_inspiral_aggregator: tweak kafka consumer settings to mitigate heartbeat session issues, close connection to consumer upon exit

gstlal_ll_inspiral_pipe: scale up number of aggregator jobs to keep up with real-time, gstlal_ll_inspiral_aggregator: add more specific group_id to not conflict with other aggregator jobs

gstlal_ll_inspiral_aggregator: use new aggregation classes from datamon to aggregate data, tidy up imports

aggregator execs + ll_inspiral_pipe: allow more control with number of routes processed per job, increase number of aggregator jobs in online dag for scalability

gstlal_ll_inspiral_aggregator: tweak default settings, fix busted jobs dirs for injection jobs and fix logging statement