2.1.0.M3

Change log:

a0dc601 Upgrade SF to 5.1.0.RC3
e9d553a AMQP-832: Async @RabbitListener Return Types
b19ab35 GH-804: DRTMLC - don't cancel in-use consumer
66847b6 Upgrade amqp-client to 5.4.1
444b74e AMQP-830 Enable Hostname Verification by default
8c4c1a7 AMQP-828: No Exception on normal close
18f70d5 AMQP-829: RabbitTemplate Req/Resp Fail Fast
1ed2b12 GH-796: RLEndpointRegistry - unregister
8d0d452 Polishing previous commit
2092fe6 Debug log for close of publisher callback channel
6b94b1f RabbitTemplateTests -> BDD