Reinstantiate support for Apache Axiom now that is supports jakarta

[gigermocas]

Can support for Apache Axiom be reintroduced?

Support was dropped for v4 due to it still targeting Java EE 8, but the latest Axiom release seems to have fixed this:
https://ws.apache.org/axiom/release-notes/2.0.0.html

[mdeinum]

Related (Duplicate?): #1257

[snicoll]

I don't know yet as I am still discovering things. I've triaged this one for the next feature release and we can see accordingly.

[snicoll]

I am hacking on https://github.com/snicoll/spring-ws/tree/gh-1454

I believe I've made good progress but some code has been flagged legacy so I need to review that stuff.

[snicoll]

Attachments should use MultipartBody.

[snicoll]

Unfortunately that doesn't work. MultipartBody is an immutable class and we can't use it to implement jakarta.xml.soap.SOAPMessage. Axis doesn't even use it at all.