ccd-js-gen: Flag for generating @ts-nocheck

[limemloh]

Purpose

Closes #313.
Provide flag for generating // @ts-nocheck.

Changes

• Introduce a new option in both CLI and library for enabling this.
• Extend some details in the changelog.

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

[DOBEN]

I still get the error:

'__nominal' is declared but its value is never read.
private __nominal = true;

It seems the // @ts-nocheck needs to be really at the top of the file. Currently, it is not at the top.