[FEAT] Report the time it took to review cards in a session

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First of all, I love the plugin. Thanks for writing it!
I have created a ton of cards over time, and would like to get a brief review at the end simply saying how long it took me to review the notes during my session. This certainly can be done outside of the plugin, but it'd be a nice convenience.

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When finishing reviewing the notes, display the time taken to review the notes.

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