SYCL SET operator optimized for F32 tensors (#16350)

* SYCL/SET: implement operator + wire-up; docs/ops updates; element_wise & ggml-sycl changes

* sycl(SET): re-apply post-rebase; revert manual docs/ops.md; style cleanups

* move SET op to standalone file, GPU-only implementation

* Update SYCL SET operator for F32

* ci: fix editorconfig issues (LF endings, trailing spaces, final newline)

* fixed ggml-sycl.cpp

---------

Co-authored-by: Gitty Burstein <gitty@example.com>

ggml/src/ggml-sycl/set.hpp

@@ -0,0 +1,5 @@
+#pragma once
+#include "backend.hpp"
+#include "ggml.h"
+
+void ggml_sycl_op_set(ggml_backend_sycl_context & ctx, ggml_tensor * dst);