Description:
Add support for .sdkmanrc file in java-version-file parameter.

Justification:
SDKMAN! is a popular package manager, especially for java ecosystem. Would be awesome to have an out of the box support for .sdkmanrc files in the same way as java-version-file currently supports .tool-versions by asdf.

Are you willing to submit a PR?
I hope I can find some time to file a PR.