New Experiment amip-p4K

[github-actions]

This pull request was automatically created by a GitHub Actions workflow.

Adding the following new data.

{
    "id": "amip-p4k",
    "type": [
        "wcrp:experiment",
        "cmip7"
    ],
    "activity": [
        "CFMIP"
    ],
    "branch-date": "none",
    "description": "The same as the `amip` DECK experiment, except that SSTs are subject to a uniform warming of 4K. This warming should be applied to the ice-free ocean surface only. Sea ice and SSTs in grid boxes containing sea ice remain the same as in the `amip` DECK experiment.  Reference: [Webb et al., 2017](https://doi.org/10.5194/gmd-10-359-2017)",
    "label": "amip-p4K",
    "long-label": "AMIP experiment with uniform 4K SST increase",
    "minimum-number-of-years": "44",
    "model-realms": [
        {
            "id": "agcm",
            "is-required": true
        },
        {
            "id": "aer",
            "is-required": false
        },
        {
            "id": "bgc",
            "is-required": false
        },
        {
            "id": "chem",
            "is-required": false
        }
    ],
    "parent-experiment": [
        "none"
    ],
    "start-date": "1979-01-01",
    "sub-experiment": "none",
    "tier": "1"
}

Resolves #37

[matthew-mizielinski]

Same as CMIP6