Implemented MODE Z for FtpClient

[Flofler]

I implemented MODE Z for FtpClient to save bandwidth and improve transfer times.

[Flofler]

I'm not sure if this is your preferred way to implement this with a wrapping socket. Alternatively I could change any code that is using the getInputStream() and getOutputStream() of the Socket. But then any new code that is using the Socket must know that you will have to wrap an Inflater- or DeflaterOutputStream around it.

Another solution would be to hide the Socket inside a wrapper class completely and only make the getInputStream() and getOutputStream() functions available.

[garydgregory]

Hi @Flofler

Thank you for your PR.
You should run 'mvn' by itself to run all build checks before you push to catch all errors.

[Flofler]

Hi @garydgregory

sorry, I didn't know that. This is my first PR. I fixed all issues and ran 'mvn' by myself and I think it was successful.

[Flofler]

I'm not really sure how to fix that problems of the CodeQL check. I also don't think that this problem has anything to do with my changes.

[garydgregory]

Interesting... it does not look directly related, needs investigating...

[garydgregory]

Hello @Flofler
Would you please rebase on git master? The CodeQL issues should be resolved.

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[Flofler]

Hi @garydgregory I succesfully rebased on master. You can start the workflows again :)