FEATURE: Add CC Recipients in EmailService

[paavo]

It would be nice to add CC Recipients to an E-Mail.
This would be nice to add a Client to a Support-Ticket (Jira Service Desk) for example.

emailto: support@company.tld
cc: client@clientdomain.tld

[rolandschuetz]

Hello @paavo ,

sure, feel free to make a PR, we'll review and merge it.

[rolandschuetz]

See https://github.com/code-q-web-factory/CodeQ.LinkChecker/blob/main/Classes/Infrastructure/EmailService.php#L92