[AIP-23][Discussion] Make Ed25519 Public Key Validation Return False if Key Is the Wrong Length

[thepomeranian]

AIP-23 - Make Ed25519 public key validation native return false if key has the wrong length

Summary

Changes the function native_public_key_validate used by the native Move function native fun pubkey_validate_internal to return false if the public key provided is the wrong length. Previously, this function would abort if the key length provided was incorrect. This change is gated by a feature flag.

Link to AIP: https://github.com/aptos-foundation/AIPs/blob/main/aips/aip-23.md