WASM conversion for Argon2 hashing

[polydeuxes]

This pull request introduces a WebAssembly (WASM) implementation for Argon2 hashing. The changes include:

• Conversion of the Argon2 hashing process to use WebAssembly.
• Inclusion of the argon2.js and argon2.wasm files.
• Addition of a download-wasm.sh script to download the necessary WASM files if necessary.

Despite successfully getting the WASM implementation working, the output hash (digestion) differs from the original JavaScript implementation. Currently unsure why this discrepancy exists and could not identify and resolve the issue.

[polydeuxes]

the compiled wasm files currently dont work with the program. will need to adjust.

[moonsettler]

CORS policy in modern browsers won't let this run locally, it needs a webserver.

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at file:///.../argon-bwg/argon2.wasm. (Reason: CORS request not http)
failed to asynchronously prepare wasm: [object ProgressEvent]

[moonsettler]

managed to try it out, it runs, but it gives different hashes. looked at the parameters, everything seems fine. correct algo is selected with 2.

one thing that could be different is the serialization of the message and salt?

edit: or maybe there is a step where the argon2 result needs to be 'decoded'? there is such an operation in the js version.