Reland "[includes] Remove link between SkImage.h and SkImageEncoder.h"

This is a reland of commit f60584eb0f9577bd8ae8e696c9c17060381bf6f0

Client changes:
 - https://chromium-review.googlesource.com/c/chromium/src/+/3508565
 - http://cl/433225409
 - http://cl/433450799

Original change's description:
> [includes] Remove link between SkImage.h and SkImageEncoder.h
>
> According to go/chrome-includes [1], this will save about
> 210MB (0.09%) off the Chrome build. http://screen/GVdDaRRneTRuroL
>
> [1] https://commondatastorage.googleapis.com/chromium-browser-clang/include-analysis.html#view=edges&filter=%5Ethird_party%2Fskia%2Finclude%2Fcore%2FSkImage%5C.h%24&sort=asize&reverse=&includer=%5Ethird_party%2Fskia%2Finclude%2Fcore%2FSkImage%5C.h%24&included=&limit=1000
>
> Change-Id: If911ec283a9ce2b07c8509768a6a05446573a215
> Bug: 242216
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/512416
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Kevin Lubick <kjlubick@google.com>

Bug: 242216
Change-Id: Ic61e4ac2878e7a51f389312a3a434856e2e32be3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/518277
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
29 files changed