[LBBS-90] mod_smtp_delivery_external: Improve queuing process

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Details

• Improve the queue file format (as described in the comments in this module)
• Be able to do one SMTP transaction for all recipients of a message at a given domain, rather than doing one transaction per recipient as we do now

In the case of delivering a message to several recipients at the same server, NOT batching recipients into one transaction can result in being rate limited, e.g.:

[2025-01-22 22:33:40.261]   DEBUG[2061347]: tcp.c:111 bbs_tcp_client_expect: <= 421 #4.4.5 Too many connections from your host.
[2025-01-22 22:33:40.262] WARNING[2061347]: tcp.c:116 bbs_tcp_client_expect: Missing expected response (220), got: 421 #4.4.5 Too many connections from your host.
[2025-01-22 22:33:40.262]   DEBUG[2061347]: mod_smtp_client.c:116 bbs_smtp_client_expect_final: Found '220': 421 #4.4.5 Too many connections from your host.
[2025-01-22 22:33:40.262] WARNING[2061347]: mod_smtp_client.c:119 bbs_smtp_client_expect_final: Expected '220', got: 421 #4.4.5 Too many connections from your host.
[2025-01-22 22:33:40.262]   DEBUG[2061347]: mod_smtp_delivery_external.c:619 try_send:  => QUIT

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