sp_Blitz: add warning for AG replica more than 60 seconds behind

[BrentOzar]

Is your feature request related to a problem? Please describe.
When checking health on a SQL Server with AGs, it's easy to miss that a replica is getting out of sync.

Describe the solution you'd like
Add a warning that replicas are out of sync by more than 60 seconds. Here's a query from ChatGPT that seems to work well:

SELECT 
    ag.name AS [AG Name],
    ar.replica_server_name AS [Replica Name],
    drs.database_name,
    drs.redo_queue_size AS [Redo Queue Size (KB)],
    drs.log_send_queue_size AS [Log Send Queue Size (KB)],
    drs.log_send_rate AS [Log Send Rate (KB/sec)],
    drs.redo_rate AS [Redo Rate (KB/sec)],
    ps.last_commit_time AS [Primary Commit Time],
    drs.last_commit_time AS [Replica Commit Time],
    DATEDIFF(SECOND, drs.last_commit_time, ps.last_commit_time) AS [Seconds Behind]
FROM 
    sys.dm_hadr_database_replica_states AS drs
JOIN 
    sys.availability_replicas AS ar 
    ON drs.replica_id = ar.replica_id
JOIN 
    sys.availability_groups AS ag 
    ON ar.group_id = ag.group_id
JOIN 
    sys.dm_hadr_database_replica_states AS ps 
    ON drs.group_id = ps.group_id 
    AND drs.database_id = ps.database_id
    AND ps.is_local = 1  -- primary
WHERE 
    drs.is_local = 0  -- secondary
ORDER BY 
    [Seconds Behind] DESC;

Are you ready to build the code for the feature?
Yep! I'm on it.