reexport rerandomized API in ciphersuite crates

[conradoplg]

This is something that I think will be useful, no reason to not re-export all of the generic functionality.

This also adds an aggregate_custom() to the rerandomized crate (and also re-exports it in the ciphersuite crates)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.02%. Comparing base (3ed40ad) to head (a926bde).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
frost-ristretto255/src/rerandomized.rs	0.00%	38 Missing ⚠️
frost-rerandomized/src/lib.rs	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #998      +/-   ##
==========================================
- Coverage   77.93%   77.02%   -0.92%     
==========================================
  Files          41       42       +1     
  Lines        4560     4614      +54     
==========================================
  Hits         3554     3554              
- Misses       1006     1060      +54     

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[natalieesk]

Looks good

[mergify]

Merge Queue Status

✅ The pull request has been merged at a926bde

This pull request spent 23 seconds in the queue, including 3 seconds running CI.
The checks were run on draft #1002.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • use partX() for repair share functions #1001
  • reexport rerandomized API in ciphersuite crates #998
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • use partX() for repair share functions #1001
  • reexport rerandomized API in ciphersuite crates #998
• #review-threads-unresolved = 0 [🛡 GitHub branch protection]
  • use partX() for repair share functions #1001
  • reexport rerandomized API in ciphersuite crates #998
• base=main