remove serde bounds from Ciphersuites

[conradoplg]

When using derive, serde adds bounds to (De)Serialize even to the Ciphersuite itself, even though that's not required. That is annoying because it requires us to add the bounds to all ciphersuite structs, but more importantly, is making things much harder in #525 since it needs to use the new default serialization methods which require serde.

This uses serde(bound = "C: Ciphersuite") to remove those bounds. See https://stackoverflow.com/questions/76107066/how-to-help-deserializer-understand-that-generics-dont-need-deserialize-bound.

Part of #525 but does not close it.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.13% 🎉

Comparison is base (eee505a) 81.17% compared to head (cd76621) 81.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #541      +/-   ##
==========================================
+ Coverage   81.17%   81.31%   +0.13%     
==========================================
  Files          30       30              
  Lines        3012     3007       -5     
==========================================
  Hits         2445     2445              
+ Misses        567      562       -5     

Files Changed	Coverage Δ
frost-core/src/frost.rs	92.36% <ø> (ø)
frost-core/src/frost/identifier.rs	98.76% <ø> (ø)
frost-core/src/frost/keys.rs	98.42% <ø> (ø)
frost-core/src/frost/keys/dkg.rs	89.13% <ø> (ø)
frost-core/src/frost/round1.rs	92.65% <ø> (ø)
frost-core/src/frost/round2.rs	100.00% <ø> (ø)
frost-core/src/verifying_key.rs	98.18% <ø> (ø)
frost-ed25519/src/lib.rs	64.06% <ø> (+0.49%)	⬆️
frost-ed448/src/lib.rs	64.06% <ø> (+0.49%)	⬆️
frost-p256/src/lib.rs	68.27% <ø> (+0.46%)	⬆️
... and 3 more

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[natalieesk]

Looks good