Apply ref_option lint findings (#7143)

Quote from the lint description:
"More flexibility, better memory optimization, and more idiomatic Rust code.

&Option<T> in a function signature breaks encapsulation because the caller must own T and move it into an Option to call with it. When returned, the owner must internally store it as Option<T> in order to return it. At a lower level, &Option<T> points to memory with the presence bit flag plus the T value, whereas Option<&T> is usually optimized to a single pointer, so it may be more optimal."

Cargo.toml

@@ -323,6 +323,7 @@ needless_continue = "deny"
 needless_lifetimes = "deny"
 option_option = "deny"
 redundant_clone = "deny"
+ref_option = "deny"
 string_add_assign = "deny"
 unnecessary_join = "deny"
 unnecessary_self_imports = "deny"