CLI outPath support

[aabounegm]

Checks if outPath (--output or -o) parameter is passed, and if so, uses it for the output instead of stdout.

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PR-Codex overview

This PR focuses on improving the logging functionality of the eo-phi-normalizer application.

Detailed summary

• Added import for System.IO module.
• Created a new handle variable for file output.
• Modified putStrLn calls to logStrLn for logging to file.
• Added hClose to close the file handle after logging is done.

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[aabounegm]

In retrospect, I'm not sure why I didn't use whatever the Haskell equivalent of freopen is (Edit: I believe the equivalent would be hDuplicateTo.

[fizruk]

Please, update documentation in the README.