feat(compiler-cli): improve error messages produced during structural errors (#20459)

The errors produced when error were encountered while interpreting the
content of a directive was often incomprehencible. With this change
these kind of error messages should be easier to understand and diagnose.

PR Close #20459

packages/compiler/src/compiler.ts

@@ -35,6 +35,7 @@ export * from './aot/compiler';
 export * from './aot/generated_file';
 export * from './aot/compiler_options';
 export * from './aot/compiler_host';
+export * from './aot/formatted_error';
 export * from './aot/static_reflector';
 export * from './aot/static_symbol';
 export * from './aot/static_symbol_resolver';