Upgrade UWS to Servlet 5+

[vforchi]

I am trying to upgrade my TAP implementation from Spring Boot 2 to 3.

Among other things, this moves to Jakarta EE (meaning Servlet 6.0, Tomcat 10...)

UWS uses Java EE, preventing this upgrade.

In general, I am not sure why UWS should be aware of HttpServletRequest.

For example: public UWSJob createJob(final HttpServletRequest request, final JobOwner user) could take a map of parameters

And UWSServlet is an abastract class that could be in a separate module. (I am not using it)