Add USDM generator for objectives

[pendingintent]

Need to create a USDM entity generator for the objectives.

{
                "id": "Objective_3",
                "extensionAttributes": [],
                "name": "OBJ3",
                "label": "",
                "description": "Behaviour",
                "text": "To assess the dose-dependent improvement in behavior. Improved scores on the Revised Neuropsychiatric Inventory (NPI-X) will indicate improvement in these\nareas.",
                "dictionaryId": null,
                "notes": [],
                "instanceType": "Objective",
                "level": {
                  "id": "Code_2451",
                  "extensionAttributes": [],
                  "code": "C85827",
                  "codeSystem": "http://www.cdisc.org",
                  "codeSystemVersion": "2024-09-27",
                  "decode": "Secondary Objective",
                  "instanceType": "Code"
                },
                "endpoints": [
                  {
                    "id": "Endpoint_6",
                    "extensionAttributes": [],
                    "name": "END6",
                    "label": "",
                    "description": "",
                    "text": "Alzheimer's Disease Assessment Scale - Cognitive Subscale, total of 11 items [ADAS-Cog (11)] at Weeks 8 and 16",
                    "dictionaryId": null,
                    "notes": [],
                    "instanceType": "Endpoint",
                    "purpose": "",
                    "level": {
                      "id": "Code_2450",
                      "extensionAttributes": [],
                      "code": "C139173",
                      "codeSystem": "http://www.cdisc.org",
                      "codeSystemVersion": "2024-09-27",
                      "decode": "Secondary Endpoint",
                      "instanceType": "Code"
                    }
                  },