fix(argon): #variants to rely on argon2 exports

[austinfelipe]

🔗 Linked issue

#16

❓ Type of change

• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Changes:

• update argon.ts to rely on argon2 exports to define variants values
• add tests to cover each individual variant
• update test comment to reflect the correct value

Why:

Currently, variants don't match argon2 lib, so when trying to verify i or d, it will fail.

Resolves #16

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[thetutlage]

Looks good. Thanks for fixing it 👍