Bump to v0.3.0

[xevisalle]

0.3.0 - 2025-02-25

Added

• Add encryption methods for u64 values [Implement encryption for u64 values #9]

Changed

• Change methods to return shared_key and allow decryption from it [Add a way to return the shared key while encrypting #7]
• Change encryption gadget to include bad encryption check [Add a check for in-circuit bad encryption #8]
• Change encryption methods to allow custom generators [Add option to encrypt using custom generator #11]