Rename cacheWillMatch lifecycle method

[jeffposnick]

Library Affected:
workbox-runtime-caching

There's currently a lifecycle method triggered by RequestWrapper.match() called cacheWillMatch(), which gives a plugin the opportunity to inspect the cached response that would normally be returned for a given request, and either return null if the cached response isn't valid (because it's expired, for instance) or return an alternative response instead (like a 206 Partial Content version of it).

There's been some internal discussion about renaming this method in the next major semver release, with cachedResponseWillBeUsed() as the current leading candidate. If folks have alternative suggestions, add them here.

[gauntface]

Let's get this in for V2 - everyone seems in favor of this and no complaints found in meeting.

[addyosmani]

cachedResponseWillBeUsed() as the current leading candidate

To echo internal support for it, 👍. SG to move ahead with it for v2.

[jeffposnick]

I'd like to get #710 merged to v2 first, and then I'll handle this renaming, since that open PR still using the cacheWillMatch() lifecycle name.