V2 - Improve validator to also provide inline validation

[dxinteractive]

• Make a new validator that adds the validator functions to meta
• Add a modifier to execute value -> meta.validate = meta.invalid

[dxinteractive]

let validate = (config) => {

let _validate = data => {
    let {keyPath} = data;
    // do validation
    return {
        meta: {
            errors: []
        }
    }
};

return (parcel) =>  parcel
    .setCall({
        validate: fn,
        submit: () => parcel.call.submit()
    })
    .modifyDown(_validate)
    .modifyUp(_validate)
}

...also...

parcel.modifyUp(parcel.call.validate)...