Add async support for argon2id

[rodrigo-speller]

This pull request introduces asynchronous, non-blocking support to the Argon2id hashing implementation, allowing hash computations to yield to the event loop and avoid blocking the main thread. It adds a new async option (with configurable yieldResolution) to both the library API and WASM loader, updates documentation, and provides comprehensive tests to verify async behavior.

Key changes include:

Async Argon2id support:

• Added an async option to the argon2id function, enabling Promise-based, non-blocking hashing with control over yielding frequency via yieldResolution. The async logic is implemented by splitting the core algorithm into a generator and providing both sync and async runners. (lib/argon2id.js, README.md) [1] [2] [3] [4]
• Updated the WASM loader (setupWasm) and its consumers to accept and propagate async options, ensuring async configuration is available throughout the stack. (lib/setup.js, index.js, test/helpers/node-loader.ts) [1] [2] [3] [4]

Documentation and testing:

• Expanded the README.md with usage instructions and examples for the async API, including details on the async and yieldResolution options.
• Added new tests to verify async hashing correctness, yielding behavior, and configuration, ensuring the async implementation yields as expected and returns correct results. (test/argon2id.spec.ts) [1] [2] [3] [4]

Other improvements:

• Updated parameter validation and context setup to support async options and defaults. [1] [2]

These changes make the Argon2id implementation suitable for browser and Node.js environments where blocking the main thread is undesirable, and provide a robust, configurable async interface.

[rodrigo-speller]

#6