Tofn compatibility fixes #4
                
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This is a continuation of LF-Decentralized-Trust-labs/agora-unknown_order#7 . This PR exposes some internals that are required by the GG20 implementation https://github.com/entropyxyz/tofn (namely, entropyxyz/tofn#27). Please feel free to propose a different API, I understand that you may have a different view on how these things can be exposed in a safe manner.
wasmfeature enabled (usingserde_wasm_bindgen)PartialEqforEncryptionKeyandDecryptionKeyn,p, andqinDecryptionKeyto assist with ZKP creationDecryptionKey::from_rng_with_safe_primes()DecryptionKey::decrypt_unchecked(),DecryptionKey::decrypt_with_randomness(),EncryptionKey::encrypt_unchecked(),EncryptionKey::add_unchecked()andEncryptionKey::mul_unchecked()no_std.