[WIP] feat: ConfidentialMPT Support

[pdp2121]

High Level Overview of Change

Support Confidential Transfers for Multi-Purpose Tokens (XLS-0096)
Spec: https://github.com/XRPLF/XRPL-Standards/tree/master/XLS-0096-confidential-mpt
Rippled PR: XRPLF/rippled#5860
mpt-crypto library: https://github.com/XRPLF/mpt-crypto

Context of Change

All cryptographic related helpers to generate El Gama keypairs and multiple proofs used for this feature will be implemented as C-binder from mpt-crypto library. Details can be found in xrpl/core/confidential/README.md folder.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (You added tests for code that already exists, or your new feature included in this PR)
• Documentation Updates
• Release

Did you update CHANGELOG.md?

• Yes
• No, this change does not impact library users

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch confidential-mpt

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