Add copyResponse and more granular stream detects

[philipwalton]

R: @jeffposnick

Fixes #2023

This PR replaces #2128 and implements the resolution from the discussion there. It adds two new, more granular feature detects for streams to workbox-core:

• canConstructReadableStream()
• canConstructResponseFromBodyStream()

And these features are used by other stream-related code to detect support.

Also, based on the feature request proposed in #2023, it adds a copyResponse() function that allows you to copy a response and modify any of the values settable via the ResponseInit object (headers, status, statusText).

The API I've landed on in this PR (totally open to suggestions though) is a function that takes a response and a modifier() function, here's an example (you can also see other examples in the test file):

const newResponse = await copyResponse(oldResponse, (init) => {
  init.headers.set('Content-Type', 'text/plain');
  init.headers.set('X-One', '1');
  init.status = 203;
  init.statusText = 'Really?';

  return init;
});

In addition, as currently implement, the modifier() function is optional, and if not passed then no modifications are made. This is equivalent to the old cleanRedirect() function that this PR removes. (I'm not sure if it's weird to have the modifier() function be optional. If you think it is, I can make it required and just have it be a no-op in the redirect case.)

[jeffposnick]

Thanks for taking this approach.

(There are some test things to clean up before merging.)

[workbox-pr-bot]

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Changed File Sizes

File	Before	After	Change	GZipped
packages/workbox-core/build/workbox-core.prod.js	5.94 KB	6.42 KB	+8%	2.66 KB
packages/workbox-precaching/build/workbox-precaching.prod.js	4.99 KB	4.84 KB	-3%	1.87 KB
packages/workbox-streams/build/workbox-streams.prod.js	1.46 KB	1.44 KB	-2%	699 B

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All File Sizes

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File	Before	After	Change	GZipped
packages/workbox-background-sync/build/workbox-background-sync.prod.js	3.87 KB	3.87 KB	0%	1.60 KB
packages/workbox-broadcast-update/build/workbox-broadcast-update.prod.js	1.02 KB	1.02 KB	0%	578 B
packages/workbox-build/build/_types.js	41 B	41 B	0%	61 B
packages/workbox-build/build/generate-sw.js	1.99 KB	1.99 KB	0%	966 B
packages/workbox-build/build/get-manifest.js	1.60 KB	1.60 KB	0%	779 B
packages/workbox-build/build/index.js	613 B	613 B	0%	344 B
packages/workbox-build/build/inject-manifest.js	3.13 KB	3.13 KB	0%	1.36 KB
packages/workbox-cacheable-response/build/workbox-cacheable-response.prod.js	611 B	611 B	0%	357 B
packages/workbox-cli/build/app.js	4.16 KB	4.16 KB	0%	1.64 KB
packages/workbox-cli/build/bin.js	940 B	940 B	0%	502 B
packages/workbox-core/build/workbox-core.prod.js	5.94 KB	6.42 KB	+8%	2.66 KB
packages/workbox-expiration/build/workbox-expiration.prod.js	2.95 KB	2.95 KB	0%	1.27 KB
packages/workbox-google-analytics/build/workbox-offline-ga.prod.js	1.97 KB	1.97 KB	0%	916 B
packages/workbox-navigation-preload/build/workbox-navigation-preload.prod.js	660 B	660 B	0%	323 B
packages/workbox-precaching/build/workbox-precaching.prod.js	4.99 KB	4.84 KB	-3%	1.87 KB
packages/workbox-range-requests/build/workbox-range-requests.prod.js	1.58 KB	1.58 KB	0%	801 B
packages/workbox-routing/build/workbox-routing.prod.js	3.09 KB	3.09 KB	0%	1.36 KB
packages/workbox-strategies/build/workbox-strategies.prod.js	4.10 KB	4.10 KB	0%	1.13 KB
packages/workbox-streams/build/workbox-streams.prod.js	1.46 KB	1.44 KB	-2%	699 B
packages/workbox-sw/build/workbox-sw.js	1.34 KB	1.34 KB	0%	748 B
packages/workbox-webpack-plugin/build/generate-sw.js	4.21 KB	4.21 KB	0%	1.61 KB
packages/workbox-webpack-plugin/build/index.js	349 B	349 B	0%	255 B
packages/workbox-webpack-plugin/build/inject-manifest.js	5.10 KB	5.10 KB	0%	1.77 KB
packages/workbox-window/build/workbox-window.dev.umd.js	40.62 KB	40.62 KB	0%	8.92 KB
packages/workbox-window/build/workbox-window.prod.umd.js	4.48 KB	4.48 KB	0%	1.83 KB

Workbox Aggregate Size Plugin

3.51KB gzip'ed (23% of limit)
7.93KB uncompressed

[philipwalton]

Also fixes #2129