POC to replace Headers with headers-polyfill

[brophdawg11]

trafficstars

POC to see if we could replace our Headers polyfill with headers-polyfill which is more spec-compliant. Our current polyfill (inherited when we forked this repo) implements the polyfill as class Headers extends URLSearchParams so that it can use URLSearchParams as an underlying store. While convenient, this is incorrect because it inherits a handful of fields from URLSearchParams which should not be in headers.

Closes https://github.com/remix-run/remix/issues/7067

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 01a7a85c7133e9a2a140115414f1bc4e5edb9188

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@remix-run/web-fetch	Major

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