How to pass native Java callbacks like in Python's Jsonnet binding

[bankotsu]

When sjsonnet is used from Java or as a standalone executable assembly, is there a way to inject native Java functionality (such as Pattern.quote()) to the jsonnet evaluator? i want to be able to execute simple Java code from within the jsonnet/sjsonnet code as can be performed with Python's jsonnet bindings using the evaluate_file function and passing the native_callbacks argument, and being able to invoke these callbacks using std.native(...) from within the jsonnet file.

[lihaoyi-databricks]

Since #166 merged, we should be able to pass in callbacks through the Scala API whether you are using sjsonnet.SjsonnetMain.main0 or sjsonnet.Interpreter. This problem then reduces to needing to provide an idiomatic Java API, which we can track as part of #157