[Work Item] New code formatter check to detect domains that have not been approved by CELA

[lusassl-msft]

Describe the work
We have a list of CELA approved fictitious domains and company names that we are allowed to use in examples (e.g., contoso.com) and our documentation. We should write a new code formatter check to detect if a domain is used within a markdown file and then compare it against the list of CELA approved domains. If it doesn't match, the job should fail.