Adds Chromium support for Service Worker Networking (interception/routing, Request/Response events, and HAR). Resolves #1090. Depends on #14714 and #14714. Supercedes #14321. Follow up #14711. Landed upstream patches: - https://chromium-review.googlesource.com/c/chromium/src/+/3510917 - https://chromium-review.googlesource.com/c/chromium/src/+/3526571 - https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3566669 - https://chromium-review.googlesource.com/c/chromium/src/+/3544685 - https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3610924 - https://chromium-review.googlesource.com/c/chromium/src/+/3689949
