Add total messages and unique sender / month to console

[ietf-svn-bot]

owner:[email protected] type_enhancement | by [email protected]

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Issue migrated from trac:2823 at 2022-03-03 12:58:35 +0000

[ietf-svn-bot]

@[email protected] changed status from new to accepted

[ietf-svn-bot]

@[email protected] commented

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PS: One regular bit of mail list information that Alissa wants to see regularly is the number of unique senders to IETF mailing lists (in the aggregate) over the last two months (rolling window of last 2 months).