* fix(build): remove jaxb2-maven-plugin plugin
XCJ fails due to unresolved/conflicting dependencies. The project runs fine without jaxb2-maven-plugin plugin, given maven-jaxb2-plugin is already there.
* fix(build): correct gen files imports
maven-jaxb2-plugin generates in com.baeldung.springsoap.client.gen, not com.baeldung.springsoap.gen
* chore: add postman collection
* revert: set back jaxb2-maven-plugin
Didn't run project with Java 1.8, that's why I was facing build errors
reverts cb3aed358c & 56f2b1fd93
