Combined helper measurement and helper proof seeds #1167
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Before draft 12, the Prio3 sharding algorithm used different PRG seeds for the non-leader measurement share and the non-leader proof share. Since draft 12 (spec diff), these shares are generated from the same seed (with different domain separators). This PR updates the Prio3 sharding algorithm, and also has a few cleanups.
Closes a subtask of #1122.