[BUG] `EncoderJNI.Operation` is not public, preventing the use of `EncoderJNI.push(Operation op, int length)`

[joakime]

Describe the bug When attempting to integrate Brotli4J into Eclipse Jetty we found the following ...

• The com.aayushatharva.brotli4j.encoder.Encoder class does not have the features we need (process many ByteBuffers, but not via the Channel APIs)
• We cannot even instantiate com.aayushatharva.brotli4j.encoder.Encoder, as the only constructor is package private.
• The BrotliEncoderChannel seems to be the recommended approach, but the Channel abstraction is too harsh for our needs, we need to be able to handle the ByteBuffers for input, and the ByteBuffers for output, and handle needs for input/output, to provide sane backpressure for HTTP/1, HTTP/2, and HTTP/3 use cases. (nio Channels are not appropriate for all use cases)
• That leaves us the com.aayushatharva.brotli4j.encoder.EncoderJNI.Wrapper as the level of interaction we are looking for, but we cannot use it due to class permissions issues.

To Reproduce Steps to reproduce the behavior:

1. Write a testcase that uses EncoderJNI.Wrapper from a package that is not com.aayushatharva.brotli4j.encoder. (use com.aayushatharva.brotli4j.tests yourself)
2. Attempt to use EncoderJNI.push(Operation op, int length)

Expected behavior The ability to use the public features of EncoderJNI.

Logs If applicable, add logs to help explain your problem.

Platform (please complete the following information):

• Device: Linux
• OS: Ubuntu 22.04.04 LTS
• Java Version 11, 17, 21, and 22

[hyperxpro]

Makes sense. Would you like to do a PR to expose the APIs?

[joakime]

Makes sense. Would you like to do a PR to expose the APIs?

Done, opened PR #145