Auto-configure MessageConverter for JMS classes

[mdeinum]

This commit introduces automatic configuration of the messageConverter property for both the JmsTemplate and DefaultJmsListenerContainerFactory.

When a MessageConverter is configured it will be used to configure both classes.

Fixes: gh-4282

[mdeinum]

@snicoll any change this could go into the 1.3 release? Or would it be for the next maintenance release 1.3.1?

[snicoll]

DestinationResolver is a good candidate because it definitely linked to your "whole" broker. Same thing for transaction management.

MessageConverter is a different beast. It may suit your use case but I wouldn't do this by default for two main reasons:

1. Just because you have exposed a MessageConverter in your app means that you want the default to be associated with it. How would you not associate it if you don't want to? Create your own factory which seems quite a lot for only that
2. I can perfectly see a scenario where multiple MessageConverter beans are defined. That will blow up if we merge this.

WDYT?

[mdeinum]

If you have multiple MessageConverter beans you are probably also not using the auto configuration setup as a MessageConverter on its own isn't doing much. But I can see this for the DefaultJmsListenerContainerFactory for the JmsTemplate however this would be a nice addition I guess.

[snicoll]

I want to roll this in once we have a fix for #2784

[snicoll]

@mdeinum in 1.3.3 we will have a new service to easily configure a listener container factory, check JmsListenerContainerFactoryConfigurer - Until we merge this, I think it 's a good alternative in 1.3. Let me know if that works for you please!

[snicoll]

Thanks for the PR but the code has changed quite significantly since you opened this PR and I've decided to fix it in a slightly different way (see d13b9a9)