SNARK-friendly STM: jubjub wrapper

[curiecrypt]

Content

This PR includes...

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• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
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Comments

Issue(s)

Relates to #YYY or Closes #YYY

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Test Results

    4 files  ±0    168 suites  ±0   24m 0s ⏱️ -22s
2 223 tests ±0  2 223 ✅ ±0  0 💤 ±0  0 ❌ ±0 
6 933 runs  ±0  6 933 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit dc04ec6. ± Comparison against base commit 97c27bd.

♻️ This comment has been updated with latest results.