fix(diregapic): support int64 conversion between the pf message and JSON object

[summer-ji-eng]

Similar to #1015, support int64 conversion from protobuf message to JSON object.

protobufjs

Message.toObject(message: Message [, options: ConversionOptions]): Object
converts a message instance to an arbitrary plain JavaScript object for interoperability with other libraries or storage. The resulting plain JavaScript object might still satisfy the requirements of a valid message depending on the actual conversion options specified, but most of the time it does not.

var object = AwesomeMessage.toObject(message, {
  enums: String,  // enums as string names
  longs: String,  // longs as strings (requires long.js)
  bytes: String,  // bytes as base64 encoded strings
  defaults: true, // includes default values
  arrays: true,   // populates empty arrays (repeated fields) even if defaults=false
  objects: true,  // populates empty objects (map fields) even if defaults=false
  oneofs: true    // includes virtual oneof fields set to the present field's name
});

[alexander-fenster]

can we add enums: String here too? This will make sense.

[summer-ji-eng]

I hesitated yesterday. I will add here.
BTW, I didn't test this lines. No need to test this request conversion, it covered by Message.toObject; This expect to replace by use toJSON soon.

[vchudnov-g]

This might be my ignorance of this testing framework, but is there a place where you set the book to be an int64 and see it encoded as a string? (Asking because all the bookIds here look like strings...)

[summer-ji-eng]

Right. I removed the quote.
Book Message with value is

Book {
  name: 'book-name',
  author: 'book-author',
  title: 'book-title',
  read: true,
  bookId: Long { low: 0, high: 2097152, unsigned: false }
}

Convert to JSON object

{
  name: 'book-name',
  author: 'book-author',
  title: 'book-title',
  read: true,
  bookId: '9007199254740992'
}

[alexander-fenster]

@summer-ji-eng I added one commit that adds a call to .fromObject() for the request (making possible to pass enums and big integers as strings into the request) and renamed a few variables to increase readability of the code.