[w3c/ServiceWorker] addRoutes should check for requestMethod (Issue #1747)

Route condition requestMethod is compared to a request method as part of https://w3c.github.io/ServiceWorker/#match-router-condition.
Like done for Request constructor, requestMethod should be:
1. validated with https://fetch.spec.whatwg.org/#concept-method and https://fetch.spec.whatwg.org/#forbidden-method
2. normalized with https://fetch.spec.whatwg.org/#concept-method-normalize.

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