Revert "Move src/images to src/encode"

This reverts commit cdb0955534cd7400c67dc82b8e549a2892853e87.

Reason for revert: Chrome has reverted https://chromium-review.googlesource.com/c/chromium/src/+/4262691

Original change's description:
> Move src/images to src/encode
>
> This better aligns to include/encode and more accurately describes what
> files in the folder do (encode pixels into .png, .jpeg, etc).
>
> Change-Id: Ib85a6417ed4b03b9a02cc19582fddfc7d3802dbd
> Bug: skia:13983
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/644318
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Commit-Queue: Kevin Lubick <kjlubick@google.com>

Bug: skia:13983
Change-Id: Ic241d061edcd84e2ff3791a7df127014a483803a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/645058
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
27 files changed