Typescriptify the main process code (1/N)

Summary:
As a first step I've configured bundling for the main process code using Metro. For now I haven't converted anything to ts, just made that possible.

The bundle is just produced into the "static" directory. To avoid too many changes I kept the "static" folder as it is, but probably non-static code should be moved from there.

Also installed modules from "node_modules" for the main process are not bundled to avoid potential issues with node native modules.

Reviewed By: mweststrate

Differential Revision: D19960982

fbshipit-source-id: efbd426254e2b37c913c5f5f75f042c50ccee2f3

static/transforms/electron-requires.js

@@ -78,7 +78,10 @@ module.exports = function(babel) {
 
         const source = path.node.arguments[0].value;
 
-        if (BUILTINS.includes(source)) {
+        if (
+          BUILTINS.includes(source) ||
+          BUILTINS.some(moduleName => source.startsWith(`${moduleName}/`))
+        ) {
           path.node.callee.name = 'electronRequire';
         }