remove mixin into alloysmelter and use integration instead

[justliliandev]

Issue Reference

fixes #1

Proposed Changes

removes mixin with semi-stable api method (no plans for change, but we allow changes during alpha)

Additional Context

if you need anything in the future, pls ask for api instead of create a mixin, thanks

P.S.
where is the KubeIOConstants class?

[rlnt]

The KubeIOConstants class is generated when running the build task. It's a plugin called BuildConfig, defined here.

[rlnt]

Blocked until the maven is available again.