Capture optimization log

[SPC-code]

Currently, optimization log is dropped to stdout. I can redirect stdout manually during the optimization, but it would be nice to be able to catch it in library API.

[atraplet]

The optimization log is controlled by the native library. On the Java side it is only possible to enable or disable it. At the moment, I don't see how this could be done without changing the library's native code. If you have any suggestion how this could be done, pls let me know.

[SPC-code]

I thought that just redirecting stdout should work, but it does not for FFM code. I will try some other things.

[SPC-code]

@atraplet the feature for capturing log was merged into Clarabel: oxfordcontrol/Clarabel.rs#160

Could you please reopen the issue?

[atraplet]

In order to be able to set the filename from the Java side, we would also need some changes in the C API of Clarabel in https://github.com/oxfordcontrol/Clarabel.cpp.