Avoid ETS lookup if no extra_bcc queue set

[ansd]

A queue (Q1) can have an extra_bcc queue (Q2).
Whenever a message is routed to Q1, it must also be routed to Q2.

Commit fc2d37e (in 3.10.x, but not in 3.9.x) puts the logic to determine extra_bcc queues into rabbit_exchange:route/2.
That is functionally correct because it ensures that messages being dead lettered to target queues will also route to the target queues' extra_bcc queues. For every message being routed, that commit uses ets:lookup/2 just to check for an extra_bcc queue (blue rectangle D below).

Technically, that commit is not a regression because it does not slow down the common case where a message is routed to a single target queue because before that commit rabbit_channel:deliver_to_queues/3 used two ets:lookup/2 calls (blue rectangles A and B below).

However we can do better by avoiding the ets:lookup/2 for the common case where there is no extra_bcc queue set.

One option is to use ets:lookup_element/3 to only fetch the queue options field as demonstrated here.

A better option (implemented in this PR) is determining whether to send to an extra_bcc queue in the rabbit_channel and in the at-most and at-least once dead lettering modules where the queue records have already been looked up.

Performance

Single node RabbitMQ cluster and latest Java perf-test client running both on the same Intel NUC11 with 8 CPUs, 32GB RAM, Ubuntu 22.04, Erlang OTP 25.0-rc3.

RabbitMQ server started via

make run-broker LEAVE_PLUGINS_DISABLED=1 RABBITMQ_CONFIG_FILE="advanced.config" RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+JPperf true +S 4"

advanced.config

[
 {rabbit,[
  {vm_memory_high_watermark,{absolute,12_000_000_000}},
  {credit_flow_default_credit, {1600, 800}}
 ]}
].

2 publishers sending to a stream:

-x 2 -y 0 -qa x-queue-type=stream -ad false -f persistent -u some-long-queue-name-to-copy-more-memory-from-ets -z 15

Sending rate avg (msgs/s):
3.9.17: 252k - 260k
3.10.1: 250k - 262k
PR: 259k - 273k

CPU Flame Graphs

3.9.17
A is this line
B is this line

3.10.1
C is this line
D is this line

This PR
No additional ETS lookup and therefore faster routing.