HI-01 Missing Deletions Exposing Signers Unnecessarily

The FROST protocol mandates that certain values are deleted after use to prevent replay
attacks. This includes the proof of knowledge R_i and mu_i (included in the ID class in this
implementation), the secret shares f(j) for all j, and the private and public nonces e,d,
E, D. None of the values are deleted and therefore signers are unnecessarily exposed to
protocol attacks