✨ [FEATURE]: Add default input values and outer state management options

[thinkjrs]

Is your feature request related to a problem? Please describe.
It would be nice to be able to customize default input values in the options config object.

Describe the solution you'd like
Add inputValues and other keys to options object, e.g.

<PromoButton
  options={{
    inputValues: {
      adTitle: "My default title",
      budget: 55,
      target: "https://b00st.com",
      adCopy: "Save time and make defaults!",
      adCallToAction: "Do it now!",
      buttonText: "Sign up",
    }
  }}
/>

In contrast to #80 , these options should actually be proper "defaults" and eventually filter through to the backend submission, without any user input (other than submitting the form).

Use cases

1. Pre-fill promo-button developer app button with optimized defaults
2. Pre-fill a past campaign to be re-run
3. Generally handle and/or expose PromoButton state data from a parent component, such as a developer's app dashboard.

Requirements

• add inputValues to options config
• add setPromoData to options config

If either of the above is present, use it to manage state alongside our current implementation.

For example, using setPromoData should update inside of the submitCampaign function within the PromoButton component body implementation.

Specifically:

const data = {
  target_link: event.target.target.value,
  budget: event.target.budget.value,
  email: email,
  creative_uri: fileImage,
  asset_title: event.target.adTitle.value || event.target.name.value,
};

Should include

const data = {
  target_link: event.target.target.value,
  budget: event.target.budget.value,
  email: email,
  creative_uri: fileImage,
  asset_title: event.target.adTitle.value || event.target.name.value,
};
if (typeof setPromoDataset !== 'undefined') {
    setPromoData({data});
}

[thinkjrs]

I just had an additional use for this come up: state management via an HOC flow-through.

[thinkjrs]

I'm working on this now and will tag the PR as soon as it's pushed 💥