Drush command to untrack content types

Problem/Motivation

You can configure by the user interface the tracked content types but this is not possible through a drush command.

Proposed resolution

We need something like to untrack the content type article:

drush ndr-untrack article

Remaining tasks

Implement the code.

User interface changes

None.

API changes

A new drush commands is added:

drush ndr-untrack

Data model changes

None.