dan sinclair e95b59c34d Add ExternalTextureOptions
This CL adds a `writer/ExternalTextureOptions` to allow providing
external texture information to the generators. The generators are
updated to have the option in their config, but do not use it yet.

Bug: tint:1855 chromium:1421379
Change-Id: I99b122c5cae145e8527158f300da81743f89775a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/123160
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
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