RFC 3164 section 4.1.3 specifies that the tag MUST NOT exceed 32
characters.  This is enforced by
https://github.com/eric/syslog_protocol/blob/001000ffe27a4557c3ec312b9c3c50385e6a923b/lib/syslog_protocol/packet.rb#L48-L50

Ensure that the default tag generated from the program name and PID is
within these bounds.

RFC 3164 section 4.1 (also 4.3.2 and 6.1) specifies that the packet
length MUST NOT exceed 1024 bytes.  This is enforced by
https://github.com/eric/syslog_protocol/blob/001000ffe27a4557c3ec312b9c3c50385e6a923b/lib/syslog_protocol/packet.rb#L16-L21
by truncating the packet to this length (by default).

Ensure that we don't lose parts of long log messages by splitting them
into chunks accordingly and sending each chunk in an individual packet.

Prefix continuation chunks with a configurable prefix (default: ellipsis
followed by space) so they can be identified as such more easily.

Also make the maximum packet size configurable; while RFC 3164 specifies
a maximum packet size of 1024, some implementations (e.g. rsyslog)
support larger sizes.

Tested to work with activesupport 5.2.2.