vulkan: Optimize contiguous copies (#10254)

* tests: Fix memory bandwidth calculation for perf tests

Add a flops calculation for flash attention.

Add one GGML_OP_CPY perf test.

* vulkan: Optimize contiguous copies

Add a variant of the copy shader for when the tensors are contiguous. Avoid
the complex addressing calculations, and do four elements per invocation
to hide some other overhead.

Apply similar changes to the scale shader, since scale is always contiguous.

Add a "progress bar" for shader compiles.

ggml/src/vulkan-shaders/generic_unary_head.comp

@@ -1,4 +1,5 @@
 #extension GL_EXT_shader_16bit_storage : require
+#extension GL_EXT_control_flow_attributes : require
 
 layout (push_constant) uniform parameter
 {
@@ -9,8 +10,6 @@ layout (push_constant) uniform parameter
     float param1; float param2;
 } p;
 
-layout(local_size_x = 512, local_size_y = 1, local_size_z = 1) in;
-
 layout (binding = 0) readonly buffer A {A_TYPE data_a[];};
 layout (binding = 1) writeonly buffer D {D_TYPE data_d[];};