XD-2521: Configure Compression Level

Allow the compression level to be set in application/servers.yml.
XD-2079: Add Retry to the RabbitMQ Source

JIRA: https://jira.spring.io/browse/XD-2079

Add StatelessRetryOperationsInterceptorFactoryBean to RabbitMQ source

Tested with the following and `LocalMessageBus` so the transformer exception is thrown to the source:

`xd:>stream create foo --definition "rabbit --enableRetry=true | transform --expression=payload/0 | null" --deploy`