[Feature request] Improve config layout so that emodels can be re-used

[eleftherioszisis]

Describe the feature

Allow defining unique emodels and reference to them in the main configuration. This will help avoid generating hoc files for the same emodel again and again and will improve the computation time of the app.

Example Use

{
  "@library": {
    "eModels": {
      "id-1": {
        "EModel": "/gpfs/bbp.cscs.ch/data/project/proj134/nexus/bbp/mmb-point-neuron-framework-model/3/e/3/1/5/c/f/EM__emodel=cADpyr__etype=cADpyr__iteration=b40985f__7.json",
        "ExtractionTargetsConfiguration": "/gpfs/bbp.cscs.ch/data/project/proj134/nexus/bbp/mmb-point-neuron-framework-model/4/3/6/a/c/b/3/9/ETC__emodel=cADpyr__etype=cADpyr__iteration=b40985f.json",
        "EModelPipelineSettings": "/gpfs/bbp.cscs.ch/data/project/proj134/nexus/bbp/mmb-point-neuron-framework-model/e/4/2/1/8/8/5/d/EMPS__emodel=cADpyr__etype=cADpyr__iteration=b40985f.json",
        "FitnessCalculatorConfiguration": "/gpfs/bbp.cscs.ch/data/project/proj134/nexus/bbp/mmb-point-neuron-framework-model/5/6/3/d/f/b/4/2/FCC__emodel=cADpyr__etype=cADpyr__iteration=b40985f.json",
        "EModelConfiguration": "/gpfs/bbp.cscs.ch/project/proj134/scratch/workflow-outputs/14122023-7e57c709-7b1b-448b-bd84-5b6f786bc704/meModelConfig/stage/EMC__emodel=cADpyr__etype=cADpyr__iteration=b40"
      }
    }
  },
  "configuration": {
    "AAA": {
      "GEN_mtype":{
        "GIN_etype": {
          "assignmentAlgorithm": "assignOne",
          "eModel": "id-1"
        }
      }
    },
    "ACAd1": {
      "L1_DAC": {
        "bNAC": {
          "assignmentAlgorithm": "assignOne",
          "eModel": "id-1"
        }
      }
    }
  }
}

Use cases

See above

[arnaudon]

I forgot to close this, it has be done.