[AMQ-8324] Add design doc for Jakarta Messaging 3.1 asynchronous send

[kenliao94]

Add design doc for implementing Jakarta Messaging 3.1 asynchronous send per the latest process discussed on dev list.

Note to reviewers, GitHub rich diff doesn't render image properly. You can click "view file" from the hamburger button to see the rendered markdown.

[cshannon]

I don't really like the use of images as they are not easily modifiable. Markdown supports code blocks (and you can mark it as java) so I would use something like that instead.

[cshannon]

Image is fine for design diagram/schema. However, it should not be used for code. Instead we should use the markdown code block: the huge advantage is that we can suggest change during the review.

+1 for this

[kenliao94]

Thanks @cshannon and @jbonofre for the feedback, I will use code block instead. Hoping to publish a new revision tmr.

[kenliao94]

Use codeblock instead of image.

[cshannon]

I haven't had a chance to get back to looking at this yet but still plan to, @mattrpav have you had a change to review this yet?