feat: externalize ngWalker to support custom lint rules

src/angular/index.ts

@@ -0,0 +1,7 @@
+export * from './templates/basicTemplateAstVisitor';
+
+export * from './styles/basicCssAstVisitor';
+
+export * from './config';
+export * from './metadata';
+export * from './ngWalker';

src/index.ts

@@ -37,7 +37,7 @@ export { Rule as UsePipeDecoratorRule } from './usePipeDecoratorRule';
 export { Rule as UsePipeTransformInterfaceRule } from './usePipeTransformInterfaceRule';
 export { Rule as UseViewEncapsulationRule } from './useViewEncapsulationRule';
 
-export * from './angular/config';
+export * from './angular';
 
 // this file exists for tslint to resolve the rules directory
 export const rulesDirectory = '.';