CookieStore cleanup/fixes

* Remove TODO
* Remove Cookie::set_ setters
* Do not expose SameSite enum, provide getters on Cookie instead
* Simplify Response::cookies signature (now ignores errors)

src/response.rs

@@ -124,10 +124,11 @@ impl Response {
     }
 
     /// Retrieve the cookies contained in the response.
-    pub fn cookies<'a>(&'a self) -> impl Iterator<
-        Item = Result<cookie::Cookie<'a>, cookie::CookieParseError>
-    > + 'a {
+    /// 
+    /// Note that invalid 'Set-Cookie' headers will be ignored.
+    pub fn cookies<'a>(&'a self) -> impl Iterator< Item = cookie::Cookie<'a> > + 'a {
         cookie::extract_response_cookies(self.headers())
+            .filter_map(Result::ok)
     }