Import json directly instead of grunt.file.readJSON

[zepumph]

From #1436, let's do something like this instead:

( async () => {
  console.log( 'loading' );
  try {
    const json = await import( './json.json');
    console.log( json.hi );
  }
  catch( e ) {
    console.log( 'e', e ); // Transform failed with 1 error:
  }
} )();

Following steps in here: https://stackoverflow.com/questions/48911030/import-json-in-typescript

Looks like we just need to add "resolveJsonModule": true to support it. Let's do that in tsconfig-node for now, since we don't have esModuleInterop turned on in sim code at the moment.

[zepumph]

Or we can just use the loadJSON() function in perennial.

[zepumph]

There are 30 usages or so of grunt.file.readJSON

[samreid]

Fixed, closing.