Cw 1611 fetch moon pay payment methods from their api (#3565)

* add payment method api

* add payment method limits

* Update lib/buy/moonpay/moonpay_provider.dart

* fix MoonPay payment method handling

* Handle custom MoonPay payment methods

* fix limits when max is infinite [skip ci]

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

lib/src/screens/select_options_page.dart

@@ -41,8 +41,7 @@ abstract class SelectOptionsPage extends BasePage {
   String get title => pageTitle;
 
   @override
-  Widget body(BuildContext context) {
-    return ScrollableWithBottomSection(
+  Widget body(BuildContext context) => ScrollableWithBottomSection(
       content: BodySelectOptionsPage(
         currentTheme: currentTheme,
         items: items,
@@ -81,7 +80,6 @@ abstract class SelectOptionsPage extends BasePage {
         ),
       ),
     );
-  }
 }
 
 class BodySelectOptionsPage extends StatefulWidget {
@@ -131,8 +129,7 @@ class _BodySelectOptionsPageState extends State<BodySelectOptionsPage> {
   }
 
   @override
-  Widget build(BuildContext context) {
-    return Center(
+  Widget build(BuildContext context) => Center(
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 350),
         child: Column(
@@ -191,5 +188,4 @@ class _BodySelectOptionsPageState extends State<BodySelectOptionsPage> {
         ),
       ),
     );
-  }
 }