Update worker-request-handlers to support Cloudflare Workers SDK v2 interfaces

[jesselathamdev]

During build processes in CI we're beginning to see more and more deprecation notices indicating we need to start shifting to the newest release of Cloudflare Wrangler which is at v2.

Currently our package is keyed to using v1.x Cloudflare Wrangler which is now been deemed as Legacy by the package maintainers and is no longer receiving updates. See https://github.com/cloudflare/wrangler-legacy

The newest Cloudflare Wranger effort has been moved to https://github.com/cloudflare/workers-sdk and incorporated into a larger SDK repo.

Also to consider, how do any changes which are chased down here impact Miniflare for local development?