feat: Add DH and ECDH support

[athexweb3]

feat: Add DH and ECDH support with benchmarks

Description

This PR implements full support for Diffie-Hellman (DH) and Elliptic Curve Diffie-Hellman (ECDH) key exchanges in react-native-quick-crypto, complete with C++ native implementations, benchmarks, and comprehensive tests.

Changes

Core Implementation

• Diffie-Hellman (DH):

  • Implemented DiffieHellman class mirroring the Node.js API (createDiffieHellman, getDiffieHellman).
  • Added native C++ logic using OpenSSL EVP_PKEY for key generation and shared secret derivation.
  • Supports standard MODP groups (modp14, modp15, etc.) as well as custom prime/generator inputs.

• Elliptic Curve Diffie-Hellman (ECDH):

  • Implemented ECDH class mirroring the Node.js API (createECDH).
  • Added native C++ logic using OpenSSL EC_KEY and EVP_PKEY.
  • Supports standard curves such as secp256k1, prime256v1, and others.

Benchmarks & Tests

• Benchmarks:

  • Added dedicated benchmark suites for DH and ECDH.
  • Measures key generation and shared secret derivation performance.
  • Compared against crypto-browserify (where applicable) and native baselines.

• Tests:

  • Added comprehensive test coverage validating:

    • Key generation (sync and async).
    • Shared secret derivation consistency with Node.js.
    • Proper error handling for invalid keys and groups.
    • Interoperability between multiple instances.

Verification

• iOS: Builds and runs successfully.
• Tests: All new DH and ECDH tests pass.
• Benchmarks: Benchmarks run successfully and demonstrate native performance improvements.
• Linting: No lint or formatting issues remaining.

Checklist

• Implementation matches the Node.js crypto API.
• Native C++ implementation works on both iOS and Android.
• Benchmarks added and verifiable.
• Unit tests pass.
• Rebased on latest main (synced with release 1.0.6).