Enable logging for incoming server requests

[purusharths]

Same as #14 (closed) without duplicate commits.

The server now prints out incoming requests with some associated metadata
Function call changed to: UMBridge.serve_models([testmodel], 5232, true) with the last Bool argument acting as a trigger to initiate logging (default argument is false).

As of now, there's an extra level of verbosity with all Evaluate calls being printed out -> a possible resolution could be to export the logs to file instead. tail -f <filename> | grep "keywords" can then be used to filter for incoming requests. OR use a separate argument to enalbe logging for evaluate all together?

The two TODO's mentioned in with_logging, and serve_models refer to which of the two approach would be preferred.

[annereinarz]

My preference would be to avoid writing extra files.

Perhaps allowing for different levels of verbosity rather than bool would resolve this?

@linusseelinger thoughts?

[purusharths]

Alright. I wanted to add the logging for python serve as well. Will employ the same approach as here once finalized.