Remove statefullness from DKG instances

[piotr-roslaniec]

Type of PR:

• Feature
• Refactor

Required reviews:

• 1

What this does:

• Removes statefulness from struct Dkg
• Rewrites logic that relied on the internal state, for example, transcript verification
• Removes deprecated structures and methods (mostly related to Message)
• Fixes some serde serialization issues that came up in Key share refreshing ceremony refactor #175

Issues fixed/closed:

• Fixes Remove the remainder of statfulness from the DKG instances #108
• Fixes Get rid of g_inv and h_inv in the API #150

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 Key share refreshing ceremony refactor #175 - Please review it first

[codecov-commenter]

Codecov Report

Attention: 139 lines in your changes are missing coverage. Please review.

Comparison is base (72b8484) 78.28% compared to head (07c476c) 79.28%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
ferveo/src/bindings_python.rs	59.33%	61 Missing ⚠️
ferveo/src/api.rs	94.72%	38 Missing ⚠️
ferveo-tdec/src/decryption.rs	39.13%	14 Missing ⚠️
ferveo/src/bindings_wasm.rs	0.00%	9 Missing ⚠️
ferveo/src/dkg.rs	92.62%	9 Missing ⚠️
ferveo-tdec/src/key_share.rs	50.00%	3 Missing ⚠️
ferveo/src/refresh.rs	98.63%	3 Missing ⚠️
ferveo-common/src/keypair.rs	0.00%	1 Missing ⚠️
ferveo/src/pvss.rs	99.24%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   78.28%   79.28%   +1.00%     
==========================================
  Files          24       24              
  Lines        5066     5721     +655     
==========================================
+ Hits         3966     4536     +570     
- Misses       1100     1185      +85     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.