feat: add /-/http_router/version path to the router

Tarun Khandelwalrequested to merge
router-version-path into main

Adding the /router/version path handling, this is just a simple implementation which is intended to show the commit sha on the /-/http_router/version path.

This is done by leveraging the version_metadata https://developers.cloudflare.com/workers/runtime-apis/bindings/version-metadata/ here

part of: #47

Edited by Tarun Khandelwal

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