feat(aspnetcore-engine): support .NET Core version 3

.NET Core version 3 users use the `completeHTML` property instead of `html` to avoid the below error.

```
InvalidOperationException: Globals is not supported when prerendering via UseSpaPrerendering().
Instead, your prerendering logic should return a complete HTML page, in which you embed any information you wish to return to the client.
```

.NET Core 3 usage examples
```
export default createServerRenderer(async params => {
  // Platform-server provider configuration
  const setupOptions: IEngineOptions = {
    appSelector: '<app-root></app-root>',
    ngModule: AppServerModule,
    document: params.data.originalHtml,
    request: params,
    providers: [
      ...
    ]
  };

  const { completeHTML } = await ngAspnetCoreEngine(setupOptions);
  return { html: completeHTML };
});
```

modules/aspnetcore-engine/README.md

@@ -7,7 +7,7 @@ This is an ASP.NET Core Engine for running Angular Apps on the server for server
 ## Installation
 
 ```bash
-npm i --S @nguniversal/aspnetcore-engine
+npm i --S @nguniversal/aspnetcore-engine @nguniversal/common-engine
 # or yarn install
 ```
 

modules/aspnetcore-engine/src/interfaces/engine-options.ts

@@ -6,9 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { NgModuleFactory, StaticProvider, Type } from '@angular/core';
+import { ɵRenderOptions as RenderOptions } from '@nguniversal/common/engine';
 import { IRequestParams } from './request-params';
 
-export interface IEngineOptions {
+export interface IEngineOptions extends Pick<RenderOptions, 'publicPath' | 'inlineCriticalCss'> {
   appSelector: string;                      // e.g., <app-root></app-root>
   request: IRequestParams;                  // e.g., params
   url?: string;                             // e.g., http://testhost.com

modules/aspnetcore-engine/src/interfaces/engine-render-result.ts

@@ -7,6 +7,7 @@
  */
 
 export interface IEngineRenderResult {
+  completeHTML: string;
   html: string;
   globals: {
     styles: string;

modules/aspnetcore-engine/src/main.ts

@@ -49,6 +49,7 @@ function _getUniversalData(content: string, appSelector: string): IEngineRenderR
   }
 
   return {
+    completeHTML: content,
     // tslint:disable-next-line: no-non-null-assertion
     html: doc.querySelector(appSelector)!.outerHTML,
     globals: {
@@ -76,6 +77,7 @@ export async function ngAspnetCoreEngine(options: Readonly<IEngineOptions>)
     document: options.document || options.appSelector,
     providers: [...(options.providers || []), getReqResProviders(options.request.origin, options.request.data.request)],
     bootstrap: options.ngModule,
+    inlineCriticalCss: options.inlineCriticalCss,
   };