WC-3583 Add changeset

Author: matthewdavidrodgers

.changeset/tasty-hoops-own.md

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+---
+"@cloudflare/workers-shared": minor
+---
+
+Adds support for static routing (i.e. \_routes.json) to Workers Assets
+
+Implements the proposal noted here https://github.com/cloudflare/workers-sdk/discussions/9143
+
+In brief: when static routing is present for a Worker with assets, routing via those static rules takes precedence. When a request is evaluated in the Router Worker, the request path is first compared to the "exclude" rules. If any match, the request is forwarded directly to the Asset Worker. If instead any "include" rules match, the request is forwarded directly to the User Worker. If neither match (or static routing was not provided), the existing behavior takes over.
+
+As part of this explicit routing, when static routing is present, the check against "Sec-Fetch-Mode: navigate" (to guess if this should serve an asset or go to the User Worker for not_found_handling) is disabled. Routing can be controlled by uploading a \_routes.json, and asset serving (including when an index.html or 404.html page is served) will be more simple.