* Revert "Remove GetExternalViewEmbedder from surface (#22272)"
This reverts commit 5419f70f173db1c9f2d5db4c289560e68ce9b77b.
* Revert "Rasterizer is initialized with an external view embedder (#22405)"
This reverts commit f95df42e6e3d80f17c2024e9956768be9416717f.
Cleans up header order/grouping for consistency: associated header, C/C++ system/standard library headers, library headers, platform-specific #includes.
Adds <cstring> where strlen, memcpy are being used: there are a bunch of places we use them transitively.
Applies linter-required cleanups. Disables linter on one file due to included RapidJson header. See https://github.com/flutter/flutter/issues/65676
This patch does not cover flutter/shell/platform/darwin. There's a separate, slightly more intensive cleanup for those in progress.
