Add consent form for themarkup Facebook Pixel Hunt extension

[rhelmer]

Checklist for reviewer:

• [x] The description should reference a bug or github issue, if relevant.
• [x] There must be a CHANGELOG.md entry for any non-test change.
• [x] Any change to the NPM commands must be carefully reviewed to make sure it won't break the Add-ons pipeline.
• [x] Any version increase must follow the release process.

[knowtheory]

Created a github issue for adding a study card herE: https://github.com/mozilla-rally/rally-core-addon/issues/755

[knowtheory]

Created a github issue for adding a study card herE: https://github.com/mozilla-rally/rally-core-addon/issues/755