Enable multiple command stats to be shown

[Shirtpantswallet]

These changes extend the stats subcommand with an --ngram-size argument, which supports providing statistics for combinations of commands. I have found this useful for identifying the most common combinations of commands as candidates for further automation.

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[ellie]

Hey! Thank you for working on this 🙏

Generally looks good, though I found an issue with unicode.

chars doesn't handle unicode characters so well, as per the docs:

It’s important to remember that char represents a Unicode Scalar Value, and might not match your idea of what a ‘character’ is. Iteration over grapheme clusters may be what you actually want. This functionality is not provided by Rust’s standard library, check crates.io instead.

As mentioned there, we will probably need to use something like unicode_segmentation instead.

I hope you don't mind me pushing to your branch, but I've added a failing test case to highlight the issue