fix(compiler): make sourcemaps work in AOT mode

Inlcuded fixes:
- include preamble in generated source map
- always add a mapping for line/col 0 so that the
  generated sourcemap is not sparse
- use a uniue sourceUrl for inline templates even
  in the AOT case

packages/compiler/src/aot/compiler_options.ts

@@ -11,4 +11,6 @@ export interface AotCompilerOptions {
   i18nFormat?: string;
   translations?: string;
   enableLegacyTemplate?: boolean;
+  /** preamble for all generated source files */
+  genFilePreamble?: string;
 }