feat: introduce source maps for templates (#15011)

The main use case for the generated source maps is to give
errors a meaningful context in terms of the original source
that the user wrote.

Related changes that are included in this commit:

* renamed virtual folders used for jit:
  * ng://<module type>/module.ngfactory.js
  * ng://<module type>/<comp type>.ngfactory.js
  * ng://<module type>/<comp type>.html (for inline templates)
* error logging:
  * all errors that happen in templates are logged
    from the place of the nearest element.
  * instead of logging error messages and stacks separately,
    we log the actual error. This is needed so that browsers apply
    source maps to the stack correctly.
  * error type and error is logged as one log entry.

Note that long-stack-trace zone has a bug that 
disables source maps for stack traces,
see https://github.com/angular/zone.js/issues/661.

BREAKING CHANGE:

- DebugNode.source no more returns the source location of a node.  

Closes 14013

packages/core/src/view/text.ts

@@ -6,15 +6,12 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {isDevMode} from '../application_ref';
 import {looseIdentical} from '../util';
 
 import {BindingDef, BindingType, DebugContext, NodeData, NodeDef, NodeFlags, RootData, Services, TextData, ViewData, ViewFlags, asElementData, asTextData} from './types';
-import {checkAndUpdateBinding, getParentRenderElement, sliceErrorStack} from './util';
+import {checkAndUpdateBinding, getParentRenderElement} from './util';
 
 export function textDef(ngContentIndex: number, constants: string[]): NodeDef {
-  // skip the call to sliceErrorStack itself + the call to this function.
-  const source = isDevMode() ? sliceErrorStack(2, 3) : '';
   const bindings: BindingDef[] = new Array(constants.length - 1);
   for (let i = 1; i < constants.length; i++) {
     bindings[i - 1] = {
@@ -46,7 +43,7 @@ export function textDef(ngContentIndex: number, constants: string[]): NodeDef {
     outputs: [],
     element: undefined,
     provider: undefined,
-    text: {prefix: constants[0], source},
+    text: {prefix: constants[0]},
     query: undefined,
     ngContent: undefined
   };