[zk-token-sdk] Re-organize error types

[samkim-crypto]

Problem

The error types in the zk-token-sdk are organized by ProofError, which does not allow fine-grained control of different ways that proof generation can produce error.

Summary of Changes

Re-organized error types in the zk-token-sdk.

• cd164b1: Added deserialization error variant in AuthenticatedEncryptionError and ElGamalError types and replaced pod conversion to return these error types instead of ProofError.
• 3070d2c: Added SigmaProofVerificationError type to deal with sigma proof errors. Previously, we used a universal ProofError to catch sigma proof error, which provided less flexibility.
• 1c99510: Similar to the previous commit but for range proof. For the case of range proof, the proof generation can fail, so I added RangeProofGenerationError and RangeProofVerificationError. The RangeProofGenerationError variants are added in a follow-up PR ([zk-token-sdk] Add range proof generation error types #34065).
• 4236779: I missed updating the convert module, so I updated it.
• 609829d: Finally, I divided the ProofError into ProofGenerationError and ProofVerificationError and updated the instruction module accordingly. I also added InstructionError to catch errors that are not related to proof generation or verification (e.g. instruction decryption).

Fixes #

[codecov]

Codecov Report

Merging #34034 (0689a2f) into master (6a5b8e8) will decrease coverage by 0.1%.
Report is 3 commits behind head on master.
The diff coverage is 50.7%.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #34034     +/-   ##
=========================================
- Coverage    81.9%    81.9%   -0.1%     
=========================================
  Files         812      813      +1     
  Lines      219656   219651      -5     
=========================================
- Hits       179989   179984      -5     
  Misses      39667    39667             

[joncinque]

Just some small little micro-nits, looks great otherwise!