[Feature] Add ability to pass custom types for a string given a format hint

[paulst-cais]

What are the steps to reproduce this issue?

1. Parse a property that is type: string, but also contains the format hint, e.g. format: date-time

What happens?

There is config to parse these as a Date, but I want to be able to parse as a custom type.

What were you expecting to happen?

I was expecting this, but it would nice to have some more control.

I have a solution to allow a new config item, that will pass a format and return a type string:

if (context.output.override.customStringFormatResolver && item?.format) {
    const type = context.output.override.customStringFormatResolver(item.format);
    if (type) {
      value = type;
    }
}

Any logs, error output, etc?

N/A

Any other comments?

Happy to implement this as a PR

What versions are you using?

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