feat: add to run_config.yaml number of processes for the dask cluster and option to select start and end dates for processing

tests/run_config.yaml

@@ -17,6 +17,7 @@ workflow:
 cluster:
   use_local: false
   cores: 16
+  processes: 8
   memory: 128GB
   walltime: "2-00:59:00"
   partition: general
@@ -24,6 +25,8 @@ cluster:
 
 chunking:
   freq: '5d'
+  start_date: '2020-08-24'
+  end_date: null
 
 bc:
   rho_eff: 1800