Total number of hours for the current month

[slate5]

It could be a flag as a part of summary-report or get-status subcommand, e.g., woffu-cli summary-report --get-total-hours.
It could return Theoretical schedule and Total hours, e.g., 172h 30m and 38h 56m.

[ProtossGP32]

Thanks for the issue, feel free to open a MR if you have time to work on this.

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