feat(core): expose inputs, outputs and ngContentSelectors on ComponentFactory. (#15214)

E.g. for a component like this:
```
@Component({
  template: ‘<ng-content select=“child”></ng-content>’
})
class MyComp {
  @Input(‘aInputName’)
  aInputProp: string;

  @Output(‘aEventName’)
  aOuputProp: EventEmitter<any>;
}
```

the `ComponentFactory` will now contain the following:
- `inputs = {aInputProp: ‘aInputName’}`
- `outputs = {aOutputProp: ‘aOutputName’}`
- `ngContentSelectors = [‘child’]`

packages/compiler/src/jit/compiler.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {Compiler, ComponentFactory, Inject, Injector, ModuleWithComponentFactories, NgModuleFactory, Type, ɵgetComponentViewDefinitionFactory as getComponentViewDefinitionFactory, ɵstringify as stringify} from '@angular/core';
+import {Compiler, ComponentFactory, Inject, Injector, ModuleWithComponentFactories, NgModuleFactory, Type, ɵConsole as Console, ɵgetComponentViewDefinitionFactory as getComponentViewDefinitionFactory, ɵstringify as stringify} from '@angular/core';
 
 import {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileNgModuleMetadata, CompileStylesheetMetadata, ProviderMeta, ProxyClass, createHostComponentMeta, identifierName, ngModuleJitUrl, sharedStylesheetJitUrl, templateJitUrl, templateSourceUrl} from '../compile_metadata';
 import {CompilerConfig} from '../config';
@@ -44,7 +44,7 @@ export class JitCompiler implements Compiler {
       private _injector: Injector, private _metadataResolver: CompileMetadataResolver,
       private _templateParser: TemplateParser, private _styleCompiler: StyleCompiler,
       private _viewCompiler: ViewCompiler, private _ngModuleCompiler: NgModuleCompiler,
-      private _compilerConfig: CompilerConfig) {}
+      private _compilerConfig: CompilerConfig, private _console: Console) {}
 
   get injector(): Injector { return this._injector; }
 
@@ -66,6 +66,8 @@ export class JitCompiler implements Compiler {
   }
 
   getNgContentSelectors(component: Type<any>): string[] {
+    this._console.warn(
+        'Compiler.getNgContentSelectors is deprecated. Use ComponentFactory.ngContentSelectors instead!');
     const template = this._compiledTemplateCache.get(component);
     if (!template) {
       throw new Error(`The component ${stringify(component)} is not yet compiled!`);