✨jdk tools version management tool, switch from jenv to sdkman

[tonycody]

approval
#110

[cstamas]

-1 for several reasons:

• Nor jenv nor sdkman is "must" for build, this PR makes it looks like it is.
• use of wrapper is encouraged, while this PR would force mvn install with forced sdkman
• if you look at (parent) POM, you will see enforcer rule for maven version. I'd rather extend that with enforcer rule for Java version as well, instead to force users to one given Java provider (I personally use Temurin, but what if someone else would use Graal or whatever?)

[tonycody]

@cstamas Just historically using jenv, sdkman is just a little more friendly than jenv. maven specified by sdkman does not affect the maven wrapper, Just historically using Jenv, SDkman is just a little more friendly than Jenv. You can remove maven's qualification!