Exp: Using native CORS mw lib

[RobinTail]

• Benefits:
  • Should possibly make it easier to configure when using the well-known solution
• Disadvantages:
  • Last publish was 6 years ago: https://github.com/expressjs/cors/blob/master/lib/index.js
  • No custom headers option
  • more dependencies

[coveralls-official]

coverage: 99.886% (-0.1%) from 100.0%
when pulling 2152036 on use-cors
into 5462dd6 on master.

[RobinTail]

I don't like how that package cors is maintained.
It has substantial amount of issues that are not being solved for 6 years.
Therefore, I think, at least at the moment, I rather will keep the CORS implementation open for user customization.