refactor: import reflect metadata only in JiT mode (#1454)

Author: sis0k0

Diff for: nativescript-angular/nativescript.module.ts

@@ -3,7 +3,6 @@ import "tns-core-modules/globals";
 import "tns-core-modules/application";
 import "./zone-js/dist/zone-nativescript";
 
-import "reflect-metadata";
 import "./polyfills/array";
 import "./polyfills/console";
 

Diff for: nativescript-angular/platform-common.ts

@@ -3,7 +3,6 @@ import "tns-core-modules/globals";
 // Require application early to work around a circular import
 import "tns-core-modules/application";
 import "./zone-js/dist/zone-nativescript";
-import "reflect-metadata";
 import "./polyfills/array";
 import "./polyfills/console";
 import { profile, uptime } from "tns-core-modules/profiling";

Diff for: nativescript-angular/platform.ts

@@ -6,6 +6,8 @@ import {
     COMMON_PROVIDERS
 } from "./platform-common";
 
+import "reflect-metadata";
+
 import { NSFileSystem } from "./file-system/ns-file-system";
 
 import {