Update endpoint lgd-publication to support extra data

[dglemos]

To insert a new publication the endpoint also allows to insert optional fields:

• phenotypes linked to new and/or existing publications
• variant types linked to new and/or existing publications
• variant descriptions linked to new and/or existing publications
• mechanism linked to new and/or existing publications (Note: only "undetermined" mechanisms can be updated)
• mechanism evidence linked to new and/or existing publications

Testing
The input format is the same as the draft json data.

Input example:

{ "publications":[{
                            "publication": { "pmid": 1234 },
                            "comment": { "comment": "this is a comment", "is_public": 1 },
                            "families": { "families": 2, "consanguinity": "unknown", "ancestries": "african", "affected_individuals": 1    
                         }
                  }],
"phenotypes": [{
                                        "pmid": "1234",
                                        "summary": "",
                                        "hpo_terms": [{ "term": "Orofacial dyskinesia",
                                                        "accession": "HP:0002310",
                                                        "description": "" }]
                                    }],
"variant_types": [{
                                        "comment": "",
                                        "de_novo": false,
                                        "inherited": false,
                                        "nmd_escape": false,
                                        "primary_type": "protein_changing",
                                        "secondary_type": "inframe_insertion",
                                        "supporting_papers": ["1234"],
                                        "unknown_inheritance": true
 }],
"variant_descriptions": [{
                                        "description": "HGVS:c.9Pro",
                                        "publication": "1234"
 }],
"molecular_mechanism": {
        "name": "gain of function",
        "support": "evidence"
      },
      "mechanism_synopsis": {
        "name": "",
        "support": ""
      },
      "mechanism_evidence": [
        {
          "pmid": "1234",
          "description": "This is new evidence for the existing mechanism evidence.",
          "evidence_types": [
            {
              "primary_type": "Function",
              "secondary_type": [
                "Biochemical"
              ]
            }
          ]
        }
      ]
}

[olaaustine]

Just minor suggestion. Thanks @dglemos

[seeta-ramaraju]

LGTM

[seeta-ramaraju]

LGTM