Relax DKG ceremony constraints

[piotr-roslaniec]

Type of PR:

• Feature

Required reviews:

• 1

What this does:

• DKG now operates under relaxed ceremony constraints, where instead of n-of-m we allow for n-of-[m, validators.len()] to be considered a successful ceremony
• In this new regime, the old shares_num is effectively replaced by validators.len(), and from now on shares_num denotes the minimum number of shares (or validators) that the DKG ceremony accommodates

Issues fixed/closed:

• Fixes: #170

Notes for reviewers:

• Based on #172 - Please review it first
• CI fails because of unrelated MSRV issue with CI dependencies
• Remaining comments will be addressed in a follow-up PR, including newly created #184

[codecov-commenter]

Codecov Report

Attention: 51 lines in your changes are missing coverage. Please review.

Comparison is base (72b8484) 78.28% compared to head (6b90715) 78.17%. Report is 1 commits behind head on main.

Files	Patch %	Lines
ferveo/src/bindings_python.rs	65.11%	45 Missing :warning:
ferveo/src/bindings_wasm.rs	0.00%	5 Missing :warning:
ferveo/src/dkg.rs	98.21%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #173 +/- ## ========================================== - Coverage 78.28% 78.17% -0.11% ========================================== Files 24 24 Lines 5066 5224 +158 ========================================== + Hits 3966 4084 +118 - Misses 1100 1140 +40 ```

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