Disable "additionalProperties" validation for custom components

[benjamindehli]

Description of the bug

Custom components support adding custom/additional properties, which is beneficial. However, the "additionalProperties" validation triggers error logging and prevents the components from displaying in the GUI.

Steps To Reproduce

{
    "id": "metadata-version",
    "type": "Custom",
    "tagName": "custom-field-data",
    "hereIsAnAdditionalProperty": "value for the additional property",
    "dataModelBindings": {
        "simpleBinding": "metadata.version"
    },
    "textResourceBindings": {
        "title": "resource.metadata.version.title"
    }
}

Additional Information

No response