Upgrade prio 0.14.1 -> 0.15.3 and fix related taskprov issues #401
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Based on #400 (merge that first).
Partially addresses #350.
Partially addresses #386.
Our taskprov implementation is meant to be compatible with DAP-02/VDAF-03. The latest version of the prio crate, 0.15.3, implements VDAF-07, so it's currently not operable. Taskprov will need to catch up with DAP-07/VDAF-07. In the meantime, remove support for the old VDAFs. So that we can keep the testing logic intact, add support for Prio2, which hasn't change over the same time period.