Component Lead option should be included in the permission scheme

Currently, the components lead option is not included in the permission schemes. Therefore, permissions are not able to grant the component lead.

Requested by Karsten Silz
I suggest that, as in Bugzilla, there is an option to specify who can verify / close a bug on a per component level. This would be an optional feature, largely for projects with a dedicated QA team. The benefit of it is that it is - in these environments - clear that who can verify and close a bug.