Add the option to define spammy_tlds subdomains

[Infern1]

Describe the solution you'd like
I want to define subdomains in the list of spammy_tlds, recently I see a lot of spam coming from *.sa.com and *.za.com

Would be good if I could enter the subdomain also.

https://github.com/haraka/haraka-plugin-karma/blob/48186673ef54851a9e06b931a80dccfcf34c48f7/index.js#L903C3-L903C51

Will only get the .com