Hey there,

I added a feature that allows us to remember consent between pages and sessions. If a prop the GoogleAnalytics component has the consentCookie prop, it'll grab the JSON data from that cookie and apply it. I also added a couple utility functions to get and set those cookies from the browser. Additionally this PR adds a hook that simplifies the process of creating consent prompts. I've left an example usages in the README.

Currently, I only allow the developer to use either consentCookie or defaultConsent but not both. Another way we could handle this is to use the value of defaultConsent to dictate the default when the cookie isn't present. The current method is more GDPR friendly, however it might be nice to offer more options. Making consent granted by default right now would involve waiting for a component to mount and running either the consent function or the updateConsent function from the useConsent hook. I was wondering if I could get some opinions on this?

Resolves #447

TODO

• Related tests