vulkan: Additional type support for unary, binary, and copy (#13266)

Support f16->f32 copy.
Support f16->f16 and f32->f32 unary ops.
Support all combinations of f16/f32 for src0/src1/dst for add/sub/mul/div.

ggml/src/ggml-vulkan/vulkan-shaders/tanh.comp

@@ -16,5 +16,5 @@ void main() {
     if (i >= p.KX) {
         return;
     }
-    data_d[i] = D_TYPE(1. - 2. / (exp(2.*data_a[i]) + 1.));
+    data_d[i] = D_TYPE(1. - 2. / (exp(2.*float(data_a[i])) + 1.));
 }