Create an aggregate from subset of messages

[piotr-roslaniec]

Type of PR:

• Bugfix
• Feature

Required reviews:

• 1

What this does:

High-level idea of the changes introduced in this PR.
List relevant API changes (if any), as well as related PRs and issues.

Issues fixed/closed:

• Fixes Aggregate transcript from a subset of participants #179
• Fixes Precomputed variant should work with a threshold number of shares and not need all of them #184

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network.
E.g., if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

• Based on Remove statefullness from DKG instances #183 - Please review it first
• I will review these changes myself again after merging parent PR

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.56776% with 93 lines in your changes are missing coverage. Please review.

Project coverage is 79.98%. Comparing base (2fe8753) to head (18487e6).

Files	Patch %	Lines
ferveo/src/api.rs	94.34%	38 Missing ⚠️
ferveo-tdec/src/decryption.rs	39.13%	14 Missing ⚠️
ferveo/src/bindings_python.rs	61.11%	14 Missing ⚠️
ferveo/src/bindings_wasm.rs	0.00%	12 Missing ⚠️
ferveo/src/dkg.rs	94.38%	5 Missing ⚠️
ferveo/src/refresh.rs	98.54%	5 Missing ⚠️
ferveo-tdec/src/key_share.rs	50.00%	3 Missing ⚠️
ferveo-common/src/keypair.rs	0.00%	1 Missing ⚠️
ferveo/src/pvss.rs	99.20%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   78.16%   79.98%   +1.81%     
==========================================
  Files          24       24              
  Lines        5222     5876     +654     
==========================================
+ Hits         4082     4700     +618     
- Misses       1140     1176      +36     

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[cygnusv]

Approved as part of the R&R epic. This is currently used as the basis of #186 (still WIP), so any relevant comments can be addressed by #186