interop-testing: Support CompressedResponse for streaming

server_compressed_streaming fails for grpc-java. There is support for CompressedResponse for unary:
https://github.com/grpc/grpc-java/blob/4dba65bad436f6fa113391e1db13124167637dd3/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceImpl.java#L85-L89

But it appears there is no support for streaming. We should add support and enable server_compressed_streaming in `run_interop_tests.py`.

Start in interop-testing/src/main/java/io/grpc/testing/integration/TestServiceImpl.java, comparing the existing unary CompressedResponse support at the referenced lines with the streaming service path. Then inspect run_interop_tests.py and the server_compressed_streaming interop test. Done means streaming compressed responses are supported and server_compressed_streaming is enabled.

Written by the indexing model from the issue text.