chore: update solana deps to 4.x compatible

[bmuddha]

the update is required to resolve the validator dependency conflicts.

Summary by CodeRabbit

• Compatibility
  • Improved support for backward-compatible builds through an optional compatibility setting.
• Encryption & Decryption
  • Updated keypair handling for encryption and decryption workflows.
  • Existing encryption, decryption, and delegation behavior remains unchanged.
• Performance
  • Adjusted performance-test thresholds to reflect current data-processing and diff-operation behavior.
• Maintenance
  • Updated blockchain integration and serialization components while preserving existing functionality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d82bb43a-79ed-42a7-9956-31ad352b65c4

📥 Commits

Reviewing files that changed from the base of the PR and between 9d9fecb and 1c43f55.

📒 Files selected for processing (1)

• tests/test_commit_finalize.rs

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📝 Walkthrough

Walkthrough

Updated crate features and dependencies to replace solana-sdk with optional keypair and signer crates. Backward compatibility modules and implementations are conditionally compiled. Decryption and encryption keypair APIs, imports, and related tests now use standalone Solana types. Performance test compute-unit thresholds were increased.

Suggested reviewers: gabrielepicco, snawaz

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bmuddha/chore/update-deps

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[snawaz]

LGTM