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This is a refactoring with no semantic changes. The following types were renamed: * `flutter::AngleSurfaceManager` to `flutter::egl::Manager`. In subsequent pull requests, this type will _create_ but not _own_ surfaces. Furthermore, this type will be split up to introduce `flutter::egl::Surface` and `flutter::egl::Context`. The manager will own the contexts and each surface will be owned by its view. * `flutter::GlProcTable` to `flutter::egl::ProcTable` This also introduces an `egl` directory to the Windows embedder. Previous pull request: https://github.com/flutter/engine/pull/49895 Part of https://github.com/flutter/flutter/issues/141996 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style