[clap-v3-utils] Update dependency from zk-token-sdk to zk-sdk

[samkim-crypto]

Problem

The clap-v3-utils still relies on the zk-token-sdk, which is deprecated and replaced by zk-sdk.

Summary of Changes

I updated the dependency from zk-token-sdk to zk-sdk. I also realized that most consumers of the clap-v3-utils will not be needing the parsing of ElGamal keys, but they need to have a relatively heavy dependency on zk-sdk and curve25519. I ended up making a separate elgamal feature that can optionally be excluded.

Fixes #

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.2%. Comparing base (b3fca5d) to head (7dc34c4).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6985     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         853      853             
  Lines      375517   375517             
=========================================
- Hits       312596   312550     -46     
- Misses      62921    62967     +46     

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[joncinque]

Just a couple of small things

[joncinque]

Since we're in the "breaking" phase in v3.0.0, we can potentially make this not a default feature.

Since there aren't too many users, it might be better to not make it default, but I don't feel too strongly about it.

[samkim-crypto]

Yeah I was considering this as well, but was afraid of the breaking change. I removed elgamal from defaut.

[mergify]

For your information, the zk-keygen and zk-sdk directories are
scheduled to be relocated to solana-program/zk-elgamal-proof in a
separate repository. Additionally, the zk-token-sdk directory will
be removed. Please take these upcoming changes into account when
making modifications.

[joncinque]

looks great!