Add setting for changing log level for the log file and extend information about checking files.

[Artanias]

Describe the solution you'd like

Output to the debugging logs some intermediate information on the general list of files / directories / repos to be checked (how many candidates are there for verification, what the list consists of) - this will make it easier to debug the use of the application and understand what users are doing wrong.

Configure the logging level to the file using the codeplag settings modify --log-level {debug,info,warning,error} command. Use info by default. To get the information from the paragraph above, it will be necessary to enable debug logging.