* INT-3045: Add in & out ZeroMq channel adapters
JIRA: https://jira.spring.io/browse/INT-3045
* Add `ZeroMqMessageHandler` to produce messages into one-way ZeroMq sockets
* Add `ZeroMqMessageProducer` to consumer messages from one-way ZeroMq sockets
* Add `ConvertingBytesMessageMapper` impl for the `BytesMessageMapper` to
delegate an actual conversion into the provided `MessageConverter`
* Add `ZeroMqHeaders` for message headers constants representing ZeroMq message attributes
* Fix `ZeroMqChannel` for the proper deferred `zeroMqProxy` evaluation
* Add more JavaDocs
* Fix `ZeroMqChannelTests.testPubSubBind()` to be sure that really all the
subscribed channels get the same message from the `PUB` socket
* * Fix typo in the `ConvertingBytesMessageMapper`
* Add `this` for `doOnError()` in the `ZeroMqChannel` & `ZeroMqMessageProducer`
* Change the bind logic in the `ZeroMqMessageProducer` to `port` and let it to
bind to random port.
The actual port is available later via `getBoundPort()`
* Introduce a `ZeroMqMessageProducer.receiveRaw()` to let received `ZMsg` to
be produce as a `payload`
* Add a logic into `ZeroMqMessageHandler` to treat `ZMsg` in the payload of
request message as is without any conversion
* Fix race condition in the `ZeroMqMessageProducer` to destroy `consumerScheduler`
when the main `Flux` is complete
* * Add Java DSL for ZeroMq components
* Extract `ReactiveMessageHandlerSpec` for `ReactiveMessageHandler` impls
* Add debug message into `EmbeddedJsonHeadersMessageMapper` when cannot `decodeNativeFormat()`
* Make `ReactiveMongoDbMessageHandlerSpec` extending `ReactiveMessageHandlerSpec`
* Make `ZeroMqProxy` `autoStartup` by default
* Add `ZeroMqDslTests` to cover all the Java DSL for ZeroMq
* Introduce a `MimeTypeSerializer` to serialize a `MimeType` into JSON as a plain string;
use it as extra serializer in the `JacksonJsonUtils.messagingAwareMapper()`
* Fix typo for the `AllowListTypeResolverBuilder` inner class
* * Add some docs
* Fix Checkstyle violations
* * More docs
* Fix language in Docs
Co-authored-by: Gary Russell <grussell@vmware.com>
Co-authored-by: Gary Russell <grussell@vmware.com>
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