porting of computation & codegen from `zkfhe-generator` repository

[0xjei]

DKG

• C0 (pk)
• C2 (share_computation)
  • fix: changed L to L_PRIME in enc_bfv #1221 this is related to this circuit. we should work out on the sample to generate an L_THRESHOLD (ex. L_PRIME) dimension. Indeed, all the witness (ex. vectors) computation must be worked out. Do not merge that PR since it's partial. This should be reflected at config level as well.
• C3 (share_encryption)
• C4 (share_decryption)

Threshold

• C1 (pk_generation)
• C5 (pk_aggregation)
• CX (user_data_encryption) ex. greco
• C6 (share_decryption)
• C7 (decrypted_share_aggregation)
   

[0xjei]

@cedoor we might end up dividing the circuits in some way - maybe you take dkg or threshold.

[0xjei]

completed through #1302