Making ClassLoaderHandle public

[sundargates]

Context

Explain context and other details for this pull request.

Checklist

• ./gradlew build compiles code correctly
• Added new tests where applicable
• ./gradlew test passes all tests
• Extended README or added javadocs where applicable
• Added copyright headers for new files from CONTRIBUTING.md

[Andyz26]

@sundargates can you add a brief context in PR?

[codyrioux]

@Andyz26 I'm speculating but one benefit of the interface being public is that would-be OSS users can extend, implement and refer to it in their own namespaces if they wanted to implement some kind of wrapped version much like we do.