Basic fail points impl, test case that uses them to cause crashes when attempting to write to DB

[mystenmark]

Note that I'm not using https://docs.rs/failpoints/latest/failpoints/ (used elsewhere in the code) because it doesn't allow user-defined failpoint behavior, but only a limited set of hard-coded actions (such as panicking).

[vercel[bot]]

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[mwtian]

Looking forward to this. cc @arun-koshy for fail points.