New Experiment control-1950

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Adding the following new data.

{
    "id": "control-1950",
    "type": [
        "wcrp:experiment",
        "cmip7"
    ],
    "activity": [
        "HighResMIP2"
    ],
    "description": "Start from the end of the spinup-1950 simulation, using constant 1950s forcings Simulate for at least 100 years, ideally 150 years  References: Roberts, M. J., Reed, K. A., Bao, Q., Barsugli, J. J., Camargo, S. J., Caron, L. P., \u2026 & Zhao, M. (2025). High-Resolution Model Intercomparison Project Phase 2 (HighResMIP2) towards CMIP7. Geoscientific Model Development, 18, 1307\u20131332  [High-Resolution Model Intercomparison Project Phase 2 (HighResMIP2) towards CMIP7.pdf](https://github.com/user-attachments/files/19393788/High-Resolution.Model.Intercomparison.Project.Phase.2.HighResMIP2.towards.CMIP7.pdf)  Webpage: https://highresmip.org/experiments/experiment_cmip7/",
    "label": "control-1950",
    "long-label": "Coupled control-1950",
    "minimum-number-of-years": "100",
    "model-realms": [
        {
            "id": "aogcm",
            "is-required": true
        },
        {
            "id": "aer",
            "is-required": false
        },
        {
            "id": "bgc",
            "is-required": false
        },
        {
            "id": "chem",
            "is-required": false
        }
    ],
    "parent-experiment": [
        "none"
    ],
    "start-date": "1950-01-01",
    "sub-experiment": "none",
    "tier": "1"
}

Resolves #75