Adds polyfill service to fides-js route

[eastandwestwind]

Closes #3319

Description Of Changes

Adds polyfill service that automatically includes a fetch polyfill bundle if the detected browser is not compatible with fetch. Using a polyfill service allows us to scale to call other features we wish to include in that bundle, with minimal overhead.

Note that in testing this ticket with browsers that do not support fetch (for example using Chrome 39 and Safari 10), I ran into other issues with the fides-js code that were unrelated to fetch, pertaining to unidentified syntax issues. Since these existed before, I plan to keep this ticket scoped to including fetch when needed, and open up another ticket (#3760) for a fuller-scale evaluation of cross-browser support.

Code Changes

• Include code to call polyfill service

Steps to Confirm

• For the scope of this ticket, we only need to ensure that no regressions occur using your default / standard browser. Confirm that navigating to http://localhost:3000/fides-js-demo.html calls the polyfill service, but does not respond with any polyfill code, and all pre-existing functionality with the cookie banner is not broken:

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
• For API changes, the Postman collection has been updated

[cypress]

Passing run #3095 ↗︎

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Details:

Merge 3ed7d17 into cadbea1...
Project: fides	Commit: b31eebb772 ℹ️
Status: Passed	Duration: 00:44 💡
Started: Jul 10, 2023 2:09 PM	Ended: Jul 10, 2023 2:10 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[allisonking]

🚀