pc/consent: Fides.meta integration function

[ssangervasi]

Closes #2160
Doc: https://ethyca.atlassian.net/wiki/spaces/EN/pages/2583789680/Facebook+fides-consent.js

Code Changes

• Reverse engineered the fbq shimming process that FB just wants you to paste into pages. Somehow worse than GTM.
• Added some basic global variable tests to the cypress demo page.

Steps to Confirm

• Read all the the documentation links that I reference in the code/readme. Use this info to compile JS+TS in your head to see if my implementation of their API is reasonable.
• If you're a wizard, or have a facebook business account, try actually putting this on a page and seeing analytics changes. I can't.

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

It's been tough to integrate with Meta because:

• I'm unable to create a test account/business to see the API track/not-track end-to-end
• fbq doesn't have an API for reading what its state is, so you just have to hope a lack of error messages means something happened
• Whack-a-mole documentation

That said, the options I've provided for this function cover the cases that were documented, leaning towards privacy-by-default instead of give-away-everything by default.

[codeclimate]

Code Climate has analyzed commit b07547c and detected 6 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	6

View more on Code Climate.

[mfbrown]

@ssangervasi This makes sense to me in general. Since we are just shipping the defaults, do you think it makes sense to create cookie keys that are even more explicit? Something like meta_tracking and shopify_tracking since we can have multiple keys on a data use?

I know it's a bit repetitive, but the very obvious naming might make it easier for someone unfamiliar with the project to parse.

[Kelsey-Ethyca]

LGTM! Blessings on your whack-a-mole hunt