punycode: remove the module system detection from punycode.js

[yorkie]

• Version: latest
• Platform: any
• Subsystem: punycode

lib/punycode.js looks more like the dependency required by the core module url, which is a third party library, and the current source file lib/punycode.js is not that same style with other source files.

So I propose the following:

• add a deps directory in ./lib directory, so we can put the punycode.js there and load it just like what we are doing except for the source path. (Recommend)
• update the punycode source file to be the CMD way just like other .js files, this also needs us to add tests and maintainer for this little module even though we are just moving them from the punycode.js project.

[Fishrock123]

Duplicate of #7401