feat: add format_header

[infdahai]

this pr's target is to solve issue #281 .

[infdahai]

and we should use this header template.

//===----------------------------------------------------------------------===//
//
//                         BusTub
//
// rid.h
//
// Identification: src/include/common/rid.h
//
// Copyright (c) 2015-2019, Carnegie Mellon University Database Group
//
//===----------------------------------------------------------------------===//

[skyzh]

You don't need to replace all headers now. We will need to manually apply it to the private repo. As long as the script works, then I'm happy to get it merged.

[infdahai]

I guess the format_header py can insert some place and then execute the commands like 'make project2'