zksdk: 5.0 conformance

[Rexicon226]

anza-xyz/agave#10000

TODO:

• Need to upgrade conformance harnesses to run with 4.0 and run test-vectors on zksdk.

[codecov]

Codecov Report

❌ Patch coverage is 99.12791% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/zksdk/merlin.zig	86.66%	2 Missing ⚠️
...ksdk/sigma_proofs/grouped_ciphertext/2_handles.zig	98.80%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/runtime/program/zk_elgamal/execute.zig	92.48% <ø> (ø)
src/zksdk/elgamal.zig	100.00% <100.00%> (ø)
src/zksdk/pedersen.zig	86.95% <100.00%> (-13.05%)	⬇️
src/zksdk/range_proof/bulletproofs.zig	99.78% <100.00%> (-0.01%)	⬇️
src/zksdk/range_proof/ipp.zig	100.00% <100.00%> (ø)
src/zksdk/sigma_proofs/ciphertext_ciphertext.zig	100.00% <100.00%> (ø)
src/zksdk/sigma_proofs/ciphertext_commitment.zig	100.00% <100.00%> (ø)
...ksdk/sigma_proofs/grouped_ciphertext/3_handles.zig	99.70% <100.00%> (ø)
src/zksdk/sigma_proofs/percentage_with_cap.zig	93.26% <100.00%> (-0.17%)	⬇️
src/zksdk/sigma_proofs/pubkey_validity.zig	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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