feat(Pbkdf2): add PBKDF2 BoxSource

[XiaoXiaoSN]

Box Source: PBKDF2 (Encode)

Adds the PBKDF2 box source to Magic Box. It is disabled by default.

Details:

• Category (Kind): Encode
• Tag: #
• Default Input: salt ::pbkdf2=password

Options:

• None

Description:

Derive key bits from a password via PBKDF2 (HMAC-SHA256). Input is the salt; ::pbkdf2=. Options ::iterations=, ::dklen=.

Usage Examples:

• Input:

salt
::pbkdf2=password

• Output Box (PBKDF2):

Derived Key (hex): 0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5
Salt: salt
Iterations: 100000
Key Length (bytes): 32
Hash: SHA-256

[XiaoXiaoSN]

This PR is ready to merge!