fix(igx-ts): update error components

Author: Hristo313

packages/igx-templates/igx-ts/projects/_base/files/src/app/error-routing/error/uncaught-error.ts

@@ -0,0 +1,6 @@
+import { Component } from '@angular/core';
+
+@Component({
+  template: '<h2>Error 500: Internal Server Error</h2>'
+})
+export class UncaughtError  { }

packages/igx-templates/igx-ts/projects/_base/files/src/app/error-routing/not-found/not-found.ts

@@ -0,0 +1,6 @@
+import { Component } from '@angular/core';
+
+@Component({
+  template: '<h2>Error 404: Page not found</h2>'
+})
+export class NotFound { }