Review Cookie Consent (3.19.0)

[JamesDPC]

nsw-design-system 3.19.0 lands cookie consent.

Initial task is to review the docs at https://designsystem.nsw.gov.au/components/cookie-consent/index.html and determine an implementation path.

[JamesDPC]

The low level requirements here are:

• a modeladmin that allows cookies to be managed/listed/added/deleted
• the list of cookies needs to be kept up to date (what happens if a service changes or adds cookies ?)
• deliver the /cookie-consent-config.js content dynamically, with ability for it to be cached
• set a data-category attribute on the relevant script tag (noting that the default requirements backend does not support arbitrary attributes)
• work out how to handle embeds and other such content

An alternative is looking at whether this module https://github.com/xini/silverstripe-cookie-consent is an option that can be integrated with the component provided by the nswds. If so, need to consider if this is better implemented via a separate module.

cc @tardinha