Support for 25519 algos

[McMastS]

What?

Adds support for Ed25519 and X25519 algorithms in K6's webcrypto offering.

This PR is still in draft, and I will add the following as I have time:

• Ed25519 key generation
• Ed25519 signing
• Ed25519 verifying
• Ed25519 export
• Ed25519 import
• X25519 key generation
• X25519 derive bits
• X25519 import
• X25519 export
• See if I can help look into why the Webcrypto tests don't fail properly
• Example scripts

Why?

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

Closes #4263