chore: Export codegen parseFile function (#35000)

Summary:
This PR export the content of the `parseFile` into a parseFile function accepting a callback to buildSchema properly in `parsers/utils.js` as requested on https://github.com/facebook/react-native/issues/34872.

## Changelog

[Internal] [Changed] - Export ` parseFile` in to a `parseFile` function in `parsers/utils.js`

Pull Request resolved: https://github.com/facebook/react-native/pull/35000

Test Plan:
Run `yarn jest react-native-codegen` and ensure CI is green

![image](https://user-images.githubusercontent.com/11707729/196051689-1b61838c-477c-4be5-8df0-9f5969fcf90d.png)

Reviewed By: cortinico

Differential Revision: D40424857

Pulled By: cipolleschi

fbshipit-source-id: a700033d674b8be8e1af942dedf73155ea3ca025

packages/react-native-codegen/src/cli/parser/parser.js

@@ -11,6 +11,7 @@
 'use strict';
 
 const path = require('path');
+const {parseFile} = require('../../parsers/utils');
 const FlowParser = require('../../parsers/flow');
 const TypeScriptParser = require('../../parsers/typescript');
 
@@ -22,9 +23,10 @@ function parseFiles(files: Array<string>) {
     console.log(
       filename,
       JSON.stringify(
-        isTypeScript
-          ? TypeScriptParser.parseFile(filename)
-          : FlowParser.parseFile(filename),
+        parseFile(
+          filename,
+          isTypeScript ? TypeScriptParser.buildSchema : FlowParser.buildSchema,
+        ),
         null,
         2,
       ),