refactor: Migrated bcrypt key derivation to argon2 and aead symmetric encryption

[bizk]

Description

Closes: #3129

• Replaced bcrypt key derivation for argon2id, this approach is secure and resolves most of bcrypt common issues. Algorithm implementation uses these parameters

const (
	argon2Time    = 1 // Recommended by library authors: Uses max memory available
	argon2Memory  = 64 * 1024 // Memory usage 
	argon2Threads = 4
	argon2KeyLen  = 32 // Key bytes
)

• Replaced xsalsa20 symmetric encryption with AEAD ChaCha20Poly
• Added backward compatibility for old keys.
• Added respective tests

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🔗 zboto Link

[facundomedica]

Why are we passing nonce as dst? And are we using a nonce?