feat: migrate webRequest module to NetworkService (Part 2)

[zcbenz]

Description of Change

Refs #15791.

This PR implements InProgressRequest, which can hijack URL loader requests and provide hooks for events. The code is referenced from extensions::WebRequestProxyingURLLoaderFactory.

Note that currently InProgressRequest is not being used, and existing behaviors are not affected. The migration will be done with following steps:

1. implement the JS webRequest APIs;
2. connect JS webRequest APIs to InProgressRequest;
3. actually hijack the URL loader requests with InProgressRequest.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation is changed or added
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

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[release-clerk]

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